134-560: The North Eastern Electric Supply Company (commonly abbreviated to NESCo ) was responsible for the supply of electricity to a large amount of North East England , prior to the nationalisation of the British electricity industry with the Electricity Act 1947 . The company was established as the Newcastle upon Tyne Electric Supply Company (also abbreviated to NESCo) in 1889, but was renamed
268-455: A conductor 's surface, since otherwise there would be a force along the surface of the conductor that would move the charge carriers to even the potential across the surface. The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre,
402-461: A force on each other, an effect that was known, though not understood, in antiquity. A lightweight ball suspended by a fine thread can be charged by touching it with a glass rod that has itself been charged by rubbing with a cloth. If a similar ball is charged by the same glass rod, it is found to repel the first: the charge acts to force the two balls apart. Two balls that are charged with a rubbed amber rod also repel each other. However, if one ball
536-737: A magnetic field . In most applications, Coulomb's law determines the force acting on an electric charge. Electric potential is the work done to move an electric charge from one point to another within an electric field, typically measured in volts . Electricity plays a central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing with electrical circuits involving active components such as vacuum tubes , transistors , diodes and integrated circuits , and associated passive interconnection technologies. The study of electrical phenomena dates back to antiquity, with theoretical understanding progressing slowly until
670-467: A non-metropolitan district in the county of North Yorkshire, whilst retaining its Lord Mayor and its Sheriff. As a result of 1990s UK local government reform , York regained unitary status and saw a substantial alteration in its borders, taking in parts of Selby and Harrogate districts, and about half the population of the Ryedale district. The new boundary was imposed after central government rejected
804-409: A steady state current, but instead blocks it. The inductor is a conductor, usually a coil of wire, that stores energy in a magnetic field in response to the current through it. When the current changes, the magnetic field does too, inducing a voltage between the ends of the conductor. The induced voltage is proportional to the time rate of change of the current. The constant of proportionality
938-432: A charge of Q coulombs every t seconds passing through an electric potential ( voltage ) difference of V is where Electric power is generally supplied to businesses and homes by the electric power industry . Electricity is usually sold by the kilowatt hour (3.6 MJ) which is the product of power in kilowatts multiplied by running time in hours. Electric utilities measure power using electricity meters , which keep
1072-512: A common reference point to which potentials may be expressed and compared is useful. While this could be at infinity, a much more useful reference is the Earth itself, which is assumed to be at the same potential everywhere. This reference point naturally takes the name earth or ground . Earth is assumed to be an infinite source of equal amounts of positive and negative charge and is therefore electrically uncharged—and unchargeable. Electric potential
1206-468: A current of one amp. The capacitor is a development of the Leyden jar and is a device that can store charge, and thereby storing electrical energy in the resulting field. It consists of two conducting plates separated by a thin insulating dielectric layer; in practice, thin metal foils are coiled together, increasing the surface area per unit volume and therefore the capacitance . The unit of capacitance
1340-490: A dampened kite string and flown the kite in a storm-threatened sky . A succession of sparks jumping from the key to the back of his hand showed that lightning was indeed electrical in nature. He also explained the apparently paradoxical behavior of the Leyden jar as a device for storing large amounts of electrical charge in terms of electricity consisting of both positive and negative charges. In 1775, Hugh Williamson reported
1474-425: A large lightning cloud may be as high as 100 MV and have discharge energies as great as 250 kWh. The field strength is greatly affected by nearby conducting objects, and it is particularly intense when it is forced to curve around sharply pointed objects. This principle is exploited in the lightning conductor , the sharp spike of which acts to encourage the lightning strike to develop there, rather than to
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#17332021827451608-469: A major railway centre by the late 19th century. The introduction of the railways established engineering in the city. At the turn of the 20th century, the railway accommodated the headquarters and works of the North Eastern Railway , which employed more than 5,500 people. The railway was instrumental in the expansion of Rowntree's Cocoa Works . It was founded in 1862 by Henry Isaac Rowntree, who
1742-522: A major railway network hub and confectionery manufacturing centre. In the Second World War , part of the Baedeker Blitz bombed the city. Although York was less targeted during the war than other, more industrialised northern cities, several historic buildings were gutted and restoration took place up until the 1960s. Historic local governance of the city was as a county corporate , not included in
1876-402: A millimetre per second, the electric field that drives them itself propagates at close to the speed of light , enabling electrical signals to pass rapidly along wires. Current causes several observable effects, which historically were the means of recognising its presence. That water could be decomposed by the current from a voltaic pile was discovered by Nicholson and Carlisle in 1800,
2010-553: A more reliable source of electrical energy than the electrostatic machines previously used. The recognition of electromagnetism , the unity of electric and magnetic phenomena, is due to Hans Christian Ørsted and André-Marie Ampère in 1819–1820. Michael Faraday invented the electric motor in 1821, and Georg Ohm mathematically analysed the electrical circuit in 1827. Electricity and magnetism (and light) were definitively linked by James Clerk Maxwell , in particular in his " On Physical Lines of Force " in 1861 and 1862. While
2144-567: A palace for the King to stay in while he visited York on his Royal Tour. Anne of Denmark came to York with her children Prince Henry and Princess Elizabeth on 11 June 1603. The Mayor gave her a tour and offered her spiced wine , but she preferred beer. Guy Fawkes , who was born and educated in York, was a member of a group of Roman Catholic restorationists that planned the Gunpowder Plot . Its aim
2278-425: A positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part. Current defined in this manner is called conventional current . The motion of negatively charged electrons around an electric circuit , one of the most familiar forms of current, is thus deemed positive in the opposite direction to that of
2412-891: A practical generator, but it showed the possibility of generating electric power using magnetism, a possibility that would be taken up by those that followed on from his work. An electric circuit is an interconnection of electric components such that electric charge is made to flow along a closed path (a circuit), usually to perform some useful task. The components in an electric circuit can take many forms, which can include elements such as resistors , capacitors , switches , transformers and electronics . Electronic circuits contain active components , usually semiconductors , and typically exhibit non-linear behaviour, requiring complex analysis. The simplest electric components are those that are termed passive and linear : while they may temporarily store energy, they contain no sources of it, and exhibit linear responses to stimuli. The resistor
2546-406: A process now known as electrolysis . Their work was greatly expanded upon by Michael Faraday in 1833. Current through a resistance causes localised heating, an effect James Prescott Joule studied mathematically in 1840. One of the most important discoveries relating to current was made accidentally by Hans Christian Ørsted in 1820, when, while preparing a lecture, he witnessed the current in
2680-471: A rapidly changing one. Electric power is the rate at which electric energy is transferred by an electric circuit . The SI unit of power is the watt , one joule per second . Electric power, like mechanical power , is the rate of doing work , measured in watts , and represented by the letter P . The term wattage is used colloquially to mean "electric power in watts." The electric power in watts produced by an electric current I consisting of
2814-515: A recorded population of 141,685 in 2021 . The city was founded under the name of Eboracum in 71 AD. It then became the capital of the Roman province of Britannia Inferior , and later of the kingdoms of Deira , Northumbria , and Scandinavian York . In the Middle Ages , it became the northern England ecclesiastical province 's centre, and grew as a wool-trading centre. In the 19th century, it became
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#17332021827452948-485: A resistance is directly proportional to the potential difference across it. The resistance of most materials is relatively constant over a range of temperatures and currents; materials under these conditions are known as 'ohmic'. The ohm , the unit of resistance, was named in honour of Georg Ohm , and is symbolised by the Greek letter Ω. 1 Ω is the resistance that will produce a potential difference of one volt in response to
3082-595: A running total of the electric energy delivered to a customer. Unlike fossil fuels , electricity is a low entropy form of energy and can be converted into motion or many other forms of energy with high efficiency. Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes , transistors , diodes , sensors and integrated circuits , and associated passive interconnection technologies. The nonlinear behaviour of active components and their ability to control electron flows makes digital switching possible, and electronics
3216-431: A scientific curiosity into an essential tool for modern life. In 1887, Heinrich Hertz discovered that electrodes illuminated with ultraviolet light create electric sparks more easily. In 1905, Albert Einstein published a paper that explained experimental data from the photoelectric effect as being the result of light energy being carried in discrete quantized packets, energising electrons. This discovery led to
3350-568: A series of experiments to the Royal Society on the shocks delivered by the electric eel ; that same year the surgeon and anatomist John Hunter described the structure of the fish's electric organs . In 1791, Luigi Galvani published his discovery of bioelectromagnetics , demonstrating that electricity was the medium by which neurons passed signals to the muscles. Alessandro Volta 's battery, or voltaic pile , of 1800, made from alternating layers of zinc and copper, provided scientists with
3484-510: A series of observations on static electricity around 600 BCE, from which he believed that friction rendered amber magnetic , in contrast to minerals such as magnetite , which needed no rubbing. Thales was incorrect in believing the attraction was due to a magnetic effect, but later science would prove a link between magnetism and electricity. According to a controversial theory, the Parthians may have had knowledge of electroplating , based on
3618-448: A set of equations that could unambiguously describe the interrelationship between electric field, magnetic field, electric charge, and electric current. He could moreover prove that in a vacuum such a wave would travel at the speed of light , and thus light itself was a form of electromagnetic radiation. Maxwell's equations , which unify light, fields, and charge are one of the great milestones of theoretical physics. York York
3752-477: A solid crystal (such as a germanium crystal) to detect a radio signal by the contact junction effect. In a solid-state component, the current is confined to solid elements and compounds engineered specifically to switch and amplify it. Current flow can be understood in two forms: as negatively charged electrons , and as positively charged electron deficiencies called holes . These charges and holes are understood in terms of quantum physics. The building material
3886-511: A wire disturbing the needle of a magnetic compass. He had discovered electromagnetism , a fundamental interaction between electricity and magnetics. The level of electromagnetic emissions generated by electric arcing is high enough to produce electromagnetic interference , which can be detrimental to the workings of adjacent equipment. In engineering or household applications, current is often described as being either direct current (DC) or alternating current (AC). These terms refer to how
4020-448: A wire suspended from a pivot above the magnet and dipped into the mercury. The magnet exerted a tangential force on the wire, making it circle around the magnet for as long as the current was maintained. Experimentation by Faraday in 1831 revealed that a wire moving perpendicular to a magnetic field developed a potential difference between its ends. Further analysis of this process, known as electromagnetic induction , enabled him to state
4154-402: A wire. The informal term static electricity refers to the net presence (or 'imbalance') of charge on a body, usually caused when dissimilar materials are rubbed together, transferring charge from one to the other. Charge can be measured by a number of means, an early instrument being the gold-leaf electroscope , which although still in use for classroom demonstrations, has been superseded by
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4288-580: Is Councillor David Carr, and the Sheriff is Suzie Mercer. York Youth Council consists of several young people who negotiate with the councillors to get better facilities for York's young people, and who also elect York's Member of Youth Parliament . The results of the 2023 City of York Council election saw the Conservative Party with three councillors, the Liberal Democrats with 19 councillors,
4422-580: Is a cathedral city in North Yorkshire , England , with Roman origins , sited at the confluence of the rivers Ouse and Foss . The city has many historic buildings and other structures, such as a minster , castle , and city walls . It is the largest settlement and the administrative centre of the wider City of York district. It is located 27 miles (43 km) north-east of Leeds , 90 miles (140 km) south of Newcastle upon Tyne and 207 miles (333 km) north of London . York's built-up area had
4556-584: Is a scalar quantity . That is, it has only magnitude and not direction. It may be viewed as analogous to height : just as a released object will fall through a difference in heights caused by a gravitational field, so a charge will 'fall' across the voltage caused by an electric field. As relief maps show contour lines marking points of equal height, a set of lines marking points of equal potential (known as equipotentials ) may be drawn around an electrostatically charged object. The equipotentials cross all lines of force at right angles. They must also lie parallel to
4690-532: Is a unitary authority that operates on a leader and cabinet style of governance, having the powers of a non-metropolitan county and district council combined. It provides a full range of local government services including Council Tax billing, libraries, social services, processing planning applications, waste collection and disposal, and it is a local education authority. The city council consists of 47 councillors representing 21 wards , with one, two or three per ward serving four-year terms. Its headquarters are at
4824-411: Is a vector field . The study of electric fields created by stationary charges is called electrostatics . The field may be visualised by a set of imaginary lines whose direction at any point is the same as that of the field. This concept was introduced by Faraday, whose term ' lines of force ' still sometimes sees use. The field lines are the paths that a point positive charge would seek to make as it
4958-452: Is an important difference. Gravity always acts in attraction, drawing two masses together, while the electric field can result in either attraction or repulsion. Since large bodies such as planets generally carry no net charge, the electric field at a distance is usually zero. Thus gravity is the dominant force at distance in the universe, despite being much weaker. An electric field generally varies in space, and its strength at any one point
5092-685: Is called Eabhraig in Scottish Gaelic and Eabhrac in Irish, derived from the Latin name. The Latin Eboracum became Anglian Eoforwic in the 7th century: a compound of Eofor- , from the old name, and -wic , meaning "village", probably by conflation of the element Ebor- with a Germanic root * eburaz ('boar'); by the 7th century, the Old English for 'boar' had become eofor . When
5226-401: Is charged by the glass rod, and the other by an amber rod, the two balls are found to attract each other. These phenomena were investigated in the late eighteenth century by Charles-Augustin de Coulomb , who deduced that charge manifests itself in two opposing forms. This discovery led to the well-known axiom: like-charged objects repel and opposite-charged objects attract . The force acts on
5360-468: Is defined as negative, and that by protons is positive. Before these particles were discovered, Benjamin Franklin had defined a positive charge as being the charge acquired by a glass rod when it is rubbed with a silk cloth. A proton by definition carries a charge of exactly 1.602 176 634 × 10 coulombs . This value is also defined as the elementary charge . No object can have a charge smaller than
5494-483: Is defined as the force (per unit charge) that would be felt by a stationary, negligible charge if placed at that point. The conceptual charge, termed a ' test charge ', must be vanishingly small to prevent its own electric field disturbing the main field and must also be stationary to prevent the effect of magnetic fields . As the electric field is defined in terms of force , and force is a vector , having both magnitude and direction , it follows that an electric field
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5628-423: Is derived from Brittonic Eburākon "place of yew trees", from eburos " yew tree " (compare Welsh efwr , Breton evor , "alder, buckthorn"; Old Irish ibar , Irish iobhar , iubhar , iúr , Scottish Gaelic iubhar ) + *-āko(n) , a suffix of appurtenance meaning "belonging to", or "place of" (compare Welsh -og ). However, Eburos ( Eβουρος , Eburus , Eburius )
5762-531: Is integral to applications spanning transport , heating , lighting , communications , and computation , making it the foundation of modern industrial society. Long before any knowledge of electricity existed, people were aware of shocks from electric fish . Ancient Egyptian texts dating from 2750 BCE described them as the "protectors" of all other fish. Electric fish were again reported millennia later by ancient Greek , Roman and Arabic naturalists and physicians . Several ancient writers, such as Pliny
5896-406: Is mediated by the magnetic field each current produces and forms the basis for the international definition of the ampere . This relationship between magnetic fields and currents is extremely important, for it led to Michael Faraday's invention of the electric motor in 1821. Faraday's homopolar motor consisted of a permanent magnet sitting in a pool of mercury . A current was allowed through
6030-415: Is most often a crystalline semiconductor . Solid-state electronics came into its own with the emergence of transistor technology. The first working transistor, a germanium -based point-contact transistor , was invented by John Bardeen and Walter Houser Brattain at Bell Labs in 1947, followed by the bipolar junction transistor in 1948. By modern convention, the charge carried by electrons
6164-403: Is perhaps the simplest of passive circuit elements: as its name suggests, it resists the current through it, dissipating its energy as heat. The resistance is a consequence of the motion of charge through a conductor: in metals, for example, resistance is primarily due to collisions between electrons and ions. Ohm's law is a basic law of circuit theory , stating that the current passing through
6298-436: Is related to magnetism , both being part of the phenomenon of electromagnetism , as described by Maxwell's equations . Common phenomena are related to electricity, including lightning , static electricity , electric heating , electric discharges and many others. The presence of either a positive or negative electric charge produces an electric field . The motion of electric charges is an electric current and produces
6432-531: Is subjected to transients , such as when first energised. The concept of the electric field was introduced by Michael Faraday . An electric field is created by a charged body in the space that surrounds it, and results in a force exerted on any other charges placed within the field. The electric field acts between two charges in a similar manner to the way that the gravitational field acts between two masses , and like it, extends towards infinity and shows an inverse square relationship with distance. However, there
6566-406: Is termed the inductance . The unit of inductance is the henry , named after Joseph Henry , a contemporary of Faraday. One henry is the inductance that will induce a potential difference of one volt if the current through it changes at a rate of one ampere per second. The inductor's behaviour is in some regards converse to that of the capacitor: it will freely allow an unchanging current, but opposes
6700-415: Is the farad , named after Michael Faraday , and given the symbol F : one farad is the capacitance that develops a potential difference of one volt when it stores a charge of one coulomb. A capacitor connected to a voltage supply initially causes a current as it accumulates charge; this current will however decay in time as the capacitor fills, eventually falling to zero. A capacitor will therefore not permit
6834-524: Is therefore 0 at all places inside the body. This is the operating principal of the Faraday cage , a conducting metal shell which isolates its interior from outside electrical effects. The principles of electrostatics are important when designing items of high-voltage equipment. There is a finite limit to the electric field strength that may be withstood by any medium. Beyond this point, electrical breakdown occurs and an electric arc causes flashover between
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#17332021827456968-409: Is usually measured in volts , and one volt is the potential for which one joule of work must be expended to bring a charge of one coulomb from infinity. This definition of potential, while formal, has little practical application, and a more useful concept is that of electric potential difference , and is the energy required to move a unit charge between two specified points. An electric field has
7102-536: Is widely used in information processing , telecommunications , and signal processing . Interconnection technologies such as circuit boards , electronics packaging technology, and other varied forms of communication infrastructure complete circuit functionality and transform the mixed components into a regular working system . Today, most electronic devices use semiconductor components to perform electron control. The underlying principles that explain how semiconductors work are studied in solid state physics , whereas
7236-587: The Baltic and exported grain to Gascony and grain and wool to the Low Countries. York became a major cloth manufacturing and trading centre. Edward I further stimulated the city's economy by using the city as a base for his war in Scotland. The city was the location of significant unrest during the so-called Peasants' Revolt in 1381. The city acquired an increasing degree of autonomy from central government including
7370-727: The Bar Convent and the Guildhall which was left in total disrepair until 1960. With the emergence of tourism, the historic core of York became one of the city's major assets, and in 1968 it was designated a conservation area . The existing tourist attractions were supplemented by the establishment of the National Railway Museum in York in 1975, the Jorvik Viking Centre in 1984 and the York Dungeon in 1986. The opening of
7504-619: The Boundary Commission for England recommended the creation of two new seats for the City of York, in time for the general election in 2010 . These are York Central , which covers the inner urban area, and is entirely surrounded by the York Outer constituency. York is within the ceremonial county of North Yorkshire and, until 1974, was within the jurisdiction of the Lord Lieutenant of
7638-546: The Council of the North in York in the dissolved St Mary's Abbey. The city became a trading and service centre during this period. King Henry VIII spent a lot of time travelling around the country on official Royal Tours also known as 'progresses' In the year 1541, Henry VIII and Catherine Howard visited the city of York on their royal tour. The Royal Party would have been met outside the walls by civic dignitaries before formally entering
7772-683: The Danish army conquered the city in 866, the name was rendered in Old Norse as Jórvík . The Old French and Norman name of the city following the Norman Conquest was recorded as Everwic (modern Norman Évèroui ) in works such as Wace's Roman de Rou and as Euruic in the Domesday Book . Jórvík , meanwhile, gradually reduced to York in the centuries after the Conquest, moving from
7906-504: The Guildhall and West Offices in the city centre. York is divided into 21 administrative wards: Acomb , Bishopthorpe , Clifton , Copmanthorpe , Dringhouses and Woodthorpe , Fishergate , Fulford and Heslington , Guildhall, Haxby and Wigginton , Heworth , Heworth Without , Holgate , Hull Road, Huntington and New Earswick , Micklegate , Osbaldwick and Derwent , Rawcliffe and Clifton Without , Rural West York , Strensall , Westfield , and Wheldrake . The members of
8040-751: The Humber into Brigantian territory. The city was founded in 71 AD, when the Ninth Legion conquered the Brigantes and constructed a wooden military fortress on flat ground above the River Ouse close to its confluence with the River Foss . The fortress, whose walls were rebuilt in stone by the VI legion based there subsequent to the IX legion, covered an area of 50 acres (20 ha) and
8174-581: The Labour Party had 24 councillors and one Independent. The council went from no overall control in the 2019 election, to being run by the Labour Party holding a majority. York is the traditional county town of Yorkshire , and therefore did not form part of any of its three historic ridings , or divisions. Its Mayor has had the status of Lord Mayor since 1370, one of 23 in England. Only five of these have
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#17332021827458308-535: The Middle English Yerk in the 14th century through Yourke in the 16th century to Yarke in the 17th century. The form York was first recorded in the 13th century. Many company and place names, such as the Ebor race meeting, refer to the Roman name. The Archbishop of York signs his surname as Ebor (abbreviating Eboracensis ). Archaeological evidence suggests that Mesolithic people settled in
8442-700: The Neo-Latin word electricus ("of amber" or "like amber", from ἤλεκτρον, elektron , the Greek word for "amber") to refer to the property of attracting small objects after being rubbed. This association gave rise to the English words "electric" and "electricity", which made their first appearance in print in Thomas Browne 's Pseudodoxia Epidemica of 1646. Isaac Newton made early investigations into electricity, with an idea of his written down in his book Opticks arguably
8576-614: The River Tyne , and it opened Dunston Power Station in this new territory in 1910. By 1914 NESCo had expanded this area further by absorbing the County of Durham Electrical Power Distribution Company, the County of Durham Power Supply Company and the Houghton-le-Spring and District Electric Lighting Company. Carville B Power Station opened in 1916, the most economical power station in the World at
8710-848: The University of York in 1963 added to the prosperity of the city. In March 2012, York's Chocolate Story opened. York was voted European Tourism City of the Year by European Cities Marketing in June 2007, beating 130 other European cities to gain first place, surpassing Gothenburg in Sweden (second) and Valencia in Spain (third). York was also voted safest place to visit in the 2010 Condé Nast Traveller Readers' Choice Awards. In 2018, The Sunday Times deemed York to be its overall 'Best Place to Live' in Britain, highlighting
8844-428: The county's riding system . The city has since been locally governed as a municipal borough , county borough , and since 1996, a non-metropolitan district (the City of York), which also includes surrounding villages and rural areas, and the town of Haxby . The current district's local council, City of York Council , is responsible for providing all local services and facilities throughout this area. The city's name
8978-423: The electromagnetic force , one of the four fundamental forces of nature. Experiment has shown charge to be a conserved quantity , that is, the net charge within an electrically isolated system will always remain constant regardless of any changes taking place within that system. Within the system, charge may be transferred between bodies, either by direct contact, or by passing along a conducting material, such as
9112-511: The quantum revolution. Einstein was awarded the Nobel Prize in Physics in 1921 for "his discovery of the law of the photoelectric effect". The photoelectric effect is also employed in photocells such as can be found in solar panels . The first solid-state device was the " cat's-whisker detector " first used in the 1900s in radio receivers. A whisker-like wire is placed lightly in contact with
9246-459: The restoration of the monarchy in 1660, and the removal of the garrison from York in 1688, the city was dominated by the gentry and merchants, although the clergy were still important. Competition from Leeds and Hull , together with silting of the River Ouse, resulted in York losing its pre-eminent position as a trading centre, but its role as the social and cultural centre for wealthy northerners
9380-452: The strong interaction , but unlike that force it operates over all distances. In comparison with the much weaker gravitational force , the electromagnetic force pushing two electrons apart is 10 times that of the gravitational attraction pulling them together. Charge originates from certain types of subatomic particles , the most familiar carriers of which are the electron and proton . Electric charge gives rise to and interacts with
9514-439: The " Blue Bridge ". In October and November 2000, York experienced the worst flooding in 375 years; more than 300 homes were flooded. In December 2015, the flooding was more extensive and caused major disruption. The extreme impact led to a personal visit by Prime Minister David Cameron . Much land in and around the city is on flood plains too flood-prone for development other than agriculture. The ings are flood meadows along
9648-529: The 17th and 18th centuries. The development of the theory of electromagnetism in the 19th century marked significant progress, leading to electricity's industrial and residential application by electrical engineers by the century's end. This rapid expansion in electrical technology at the time was the driving force behind the Second Industrial Revolution , with electricity's versatility driving transformations in both industry and society. Electricity
9782-538: The 1936 discovery of the Baghdad Battery , which resembles a galvanic cell , though it is uncertain whether the artifact was electrical in nature. Electricity would remain little more than an intellectual curiosity for millennia until 1600, when the English scientist William Gilbert wrote De Magnete , in which he made a careful study of electricity and magnetism, distinguishing the lodestone effect from static electricity produced by rubbing amber. He coined
9916-603: The 19th century, having come to England as a refugee after serving as a Polish lancer in the Austro-Hungarian war. In 1942, the city was bombed during the Second World War (part of the Baedeker Blitz ) by the German Luftwaffe and 92 people were killed and hundreds injured. Buildings damaged in the raid included the Railway Station , Rowntree's Factory, Poppleton Road Primary School, St Martin-le-Grand Church,
10050-400: The 76,920 households in York, 36.0% were married couples living together, 31.3% were one-person households, 8.7% were co-habiting couples and 8.0% were lone parents. The figures for lone parent households were below the national average of 9.5%, and the percentage of married couples was also close to the national average of 36.5%; the proportion of one person households was slightly higher than
10184-641: The British Isles, the weather is changeable. York experiences most sunshine from May to July, an average of six hours per day. With its inland location, summers are often warmer than the Yorkshire coast with temperatures of 27 °C or more. Extremes recorded at the University of York campus between 1998 and 2010 include a highest temperature of 34.5 °C (94.1 °F) and a lowest temperature of −16.3 °C (2.7 °F) on 6 December 2010. The most rainfall in one day
10318-674: The County of York, West Riding and the County of The City of York . The city does retain the right to appoint its own Sheriff. The holder of the Royal dukedom of York has no responsibilities either ceremonially or administratively as regards to the city. York lies in the Vale of York , a flat area of fertile arable land bordered by the Pennines , the North York Moors and the Yorkshire Wolds . The city
10452-645: The Elder and Scribonius Largus , attested to the numbing effect of electric shocks delivered by electric catfish and electric rays , and knew that such shocks could travel along conducting objects. Patients with ailments such as gout or headache were directed to touch electric fish in the hope that the powerful jolt might cure them. Ancient cultures around the Mediterranean knew that certain objects, such as rods of amber , could be rubbed with cat's fur to attract light objects like feathers. Thales of Miletus made
10586-567: The Neptune Bank station, NESCo became one of the World's leading companies in power station development. NESCo opened Carville Power Station in 1903 to supply power for the Tyneside Electrics . In 1905 NESCo expanded its territory by taking over the Walker and Wallsend Union Gas Company. After a series of parliamentary battles with DisCo, NESCo extended its supply and distribution area south of
10720-666: The Newcastle upon Tyne Electric Supply Company and all its subsidiaries under one company. In June 1932 it bought the Durham Electrical Power Distribution Company. The British electricity industry was nationalised in 1948 under the Electricity Act 1947 . The industry was reorganised by region and the British Electricity Authority (NESCo) was set up for the North East region and was based upon
10854-520: The North Eastern Electricity Supply company as it expanded to supply the North East region. The Newcastle upon Tyne Electric Supply Company was founded in Newcastle upon Tyne , North East England , in 1889 by the industrialist John Theodore Merz . The company was one of two that were founded in the Newcastle area that year, with the Newcastle and District Electric Lighting Company (DisCo) founded by Charles Algernon Parsons . A line
10988-714: The Ouse, while the strays are open common grassland in various locations around the city. York has a temperate climate ( Cfb ) with four distinct seasons. As with the rest of the Vale of York, the city's climate is drier and warmer than the rest of the Yorkshire and the Humber region. Owing to its lowland location, York is prone to frosts, fog, and cold winds during winter, spring, and very early summer. Snow can fall in winter from December onwards to as late as April but quickly melts. As with much of
11122-566: The Venerable Bede. Edwin ordered the small wooden church be rebuilt in stone; however, he was killed in 633, and the task of completing the stone minster fell to his successor Oswald . In the following century, Alcuin of York came to the cathedral school of York. He had a long career as a teacher and scholar, first at the school at York now known as St Peter's School , founded in 627 AD, and later as Charlemagne 's leading advisor on ecclesiastical and educational affairs. In 866, Northumbria
11256-728: The area covered by NESCo, but also included the areas covered by DisCo, the Askrigg and Reeth Supply Company and the Hawes Electric Lighting Company. The area covered stretched from York to the Scottish border. British Electricity Authority (NESCo) was later renamed the North Eastern Electricity Board . Electricity Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge . Electricity
11390-475: The arrival of William the Conqueror the rebellion was put down. William at once built a wooden fortress on a motte. In 1069, after another rebellion, the king built another timbered castle across the River Ouse. These were destroyed in 1069 and rebuilt by William about the time of his ravaging Northumbria in what is called the " Harrying of the North " where he destroyed everything from York to Durham. The remains of
11524-408: The beginning of the field theory of the electric force. Further work was conducted in the 17th and early 18th centuries by Otto von Guericke , Robert Boyle , Stephen Gray and C. F. du Fay . Later in the 18th century, Benjamin Franklin conducted extensive research in electricity, selling his possessions to fund his work. In June 1752 he is reputed to have attached a metal key to the bottom of
11658-419: The building it serves to protect. The concept of electric potential is closely linked to that of the electric field. A small charge placed within an electric field experiences a force, and to have brought that charge to that point against the force requires work . The electric potential at any point is defined as the energy required to bring a unit test charge from an infinite distance slowly to that point. It
11792-615: The cabinet, led by the Council Leader , makes decisions on their portfolio areas individually. Following the Local Government Act 2000 , the Council Leader commands the confidence of the city council; the leader of the largest political group and head of the City of York Council. The Leader of the council and the cabinet (consisting of all the executive councillors) are collectively accountable for their policies and actions to
11926-426: The charged particles themselves, hence charge has a tendency to spread itself as evenly as possible over a conducting surface. The magnitude of the electromagnetic force, whether attractive or repulsive, is given by Coulomb's law , which relates the force to the product of the charges and has an inverse-square relation to the distance between them. The electromagnetic force is very strong, second only in strength to
12060-450: The charged parts. Air, for example, tends to arc across small gaps at electric field strengths which exceed 30 kV per centimetre. Over larger gaps, its breakdown strength is weaker, perhaps 1 kV per centimetre. The most visible natural occurrence of this is lightning , caused when charge becomes separated in the clouds by rising columns of air, and raises the electric field in the air to greater than it can withstand. The voltage of
12194-457: The city became a major river port, part of the extensive Viking trading routes throughout northern Europe. The last ruler of an independent Jórvík, Eric Bloodaxe , was driven from the city in 954 AD by King Eadred in his successful attempt to complete the unification of England. In 1068, two years after the Norman conquest of England , the people of York rebelled. Initially they succeeded, but upon
12328-714: The city council. The current Council Leader, Liberal Democrats ' Cllr Keith Aspden, was appointed on 22 May 2019, following the 2019 City of York Council election . York's first citizen and civic head is the Lord Mayor , who is the chairman of the City of York Council. The appointment is made by the city council each year in May, at the same time appointing the Sheriff, the city's other civic head. The offices of Lord Mayor and Sheriff are purely ceremonial. The Lord Mayor carries out civic and ceremonial duties in addition to chairing full council meetings. The incumbent Lord Mayor since 26 May 2022
12462-512: The city's "perfect mix of heritage and hi-tech" and as a "mini-metropolis with cool cafes, destination restaurants, innovative companies – plus the fastest internet in Britain". The result was confirmed in a YouGov survey, reported in August 2018, with 92% of respondents saying that they liked the city, more than any of 56 other British cities. The City of York is governed by the City of York Council . It
12596-493: The city. The civic dignitary would have been the Lord Mayor of york, who at the time of their arrival on 15 September 1541 was Robert Hall. He owned the residential property at 74 Low Petergate. Following a special service held in their honour at York minster. Henry VIII and Catherine rode from the minster down to Petergate, one of the five gateways, and over to the closed Benedictine abbey of St. Mary which had been converted into
12730-511: The company moved into their new headquarters at Carliol House in Newcastle's city centre. The building was designed by Robert Burns Dick . Carliol House Ltd. had been founded in 1924 to build and administer the building itself. It remained a separate company until 1974, after the nationalisation of the company. The North Eastern Electric Supply Company was formed under the North Eastern Electric Supply Act 1932, which brought
12864-411: The current varies in time. Direct current, as produced by example from a battery and required by most electronic devices, is a unidirectional flow from the positive part of a circuit to the negative. If, as is most common, this flow is carried by electrons, they will be travelling in the opposite direction. Alternating current is any current that reverses direction repeatedly; almost always this takes
12998-516: The design and construction of electronic circuits to solve practical problems are part of electronics engineering . Faraday's and Ampère's work showed that a time-varying magnetic field created an electric field, and a time-varying electric field created a magnetic field. Thus, when either field is changing in time, a field of the other is always induced. These variations are an electromagnetic wave . Electromagnetic waves were analysed theoretically by James Clerk Maxwell in 1864. Maxwell developed
13132-478: The early 19th century had seen rapid progress in electrical science, the late 19th century would see the greatest progress in electrical engineering . Through such people as Alexander Graham Bell , Ottó Bláthy , Thomas Edison , Galileo Ferraris , Oliver Heaviside , Ányos Jedlik , William Thomson, 1st Baron Kelvin , Charles Algernon Parsons , Werner von Siemens , Joseph Swan , Reginald Fessenden , Nikola Tesla and George Westinghouse , electricity turned from
13266-427: The effect was reciprocal: a current exerts a force on a magnet, and a magnetic field exerts a force on a current. The phenomenon was further investigated by Ampère , who discovered that two parallel current-carrying wires exerted a force upon each other: two wires conducting currents in the same direction are attracted to each other, while wires containing currents in opposite directions are forced apart. The interaction
13400-448: The electronic electrometer . The movement of electric charge is known as an electric current , the intensity of which is usually measured in amperes . Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current. Electric current can flow through some things, electrical conductors , but will not flow through an electrical insulator . By historical convention,
13534-416: The electrons. However, depending on the conditions, an electric current can consist of a flow of charged particles in either direction, or even in both directions at once. The positive-to-negative convention is widely used to simplify this situation. The process by which electric current passes through a material is termed electrical conduction , and its nature varies with that of the charged particles and
13668-428: The elementary charge, and any amount of charge an object may carry is a multiple of the elementary charge. An electron has an equal negative charge, i.e. −1.602 176 634 × 10 coulombs . Charge is possessed not just by matter , but also by antimatter , each antiparticle bearing an equal and opposite charge to its corresponding particle. The presence of charge gives rise to an electrostatic force: charges exert
13802-524: The figure as high as 500. The city, through its location on the River Ouse and its proximity to the Great North Road , became a major trading centre. King John granted the city's first charter in 1212, confirming trading rights in England and Europe. During the later Middle Ages, York merchants imported wine from France, cloth, wax, canvas, and oats from the Low Countries , timber and furs from
13936-495: The form of a sine wave . Alternating current thus pulses back and forth within a conductor without the charge moving any net distance over time. The time-averaged value of an alternating current is zero, but it delivers energy in first one direction, and then the reverse. Alternating current is affected by electrical properties that are not observed under steady state direct current, such as inductance and capacitance . These properties however can become important when circuitry
14070-451: The former city council's own proposal. From 1997 to 2010, the central part of the district was covered by the City of York constituency, while the remainder was split between the constituencies of Ryedale , Selby , and Vale of York . These constituencies were represented by Hugh Bayley , John Greenway , John Grogan , and Anne McIntosh respectively. Following their review in 2003 of parliamentary representation in North Yorkshire ,
14204-400: The material through which they are travelling. Examples of electric currents include metallic conduction, where electrons flow through a conductor such as metal, and electrolysis , where ions (charged atoms ) flow through liquids, or through plasmas such as electrical sparks. While the particles themselves can move quite slowly, sometimes with an average drift velocity only fractions of
14338-467: The national average of 30.1%. In 2001, the population density was 4,368/km (11,310/sq mi). Of those aged 16–74 in York, 24.6% had no academic qualifications, a little lower than 28.9% in all of England. Of York's residents, 5.1% were born outside the United Kingdom, significantly lower than the national average of 9.2%. White British form 95% of the population; the largest single minority group
14472-456: The pioneering Neptune Bank Power Station , which opened in 1901. It was the first power station in the United Kingdom to generate three-phase electric power , and the first to supply electricity for industrial purposes rather than just lighting. This led to the rapid expansion of NESCo, and gave the Tyneside industries an advantage over those in other areas. For the 30 years following the opening of
14606-428: The principle, now known as Faraday's law of induction , that the potential difference induced in a closed circuit is proportional to the rate of change of magnetic flux through the loop. Exploitation of this discovery enabled him to invent the first electrical generator in 1831, in which he converted the mechanical energy of a rotating copper disc to electrical energy. Faraday's disc was inefficient and of no use as
14740-721: The privileges granted by a charter of Richard II in 1396. The city underwent a period of economic decline during Tudor times. Under King Henry VIII , the Dissolution of the Monasteries saw the end of York's many monastic houses , including several orders of friars , the hospitals of St Nicholas and of St Leonard, the largest such institution in the north of England. This led to the Pilgrimage of Grace , an uprising of northern Catholics in Yorkshire and Lincolnshire opposed to religious reform. Henry VIII restored his authority by establishing
14874-506: The province of Britannia Inferior, and it is likely that it was he who granted York the privileges of a ' colonia ' or city. Constantius I died in 306 AD during his stay in York, and his son Constantine the Great was proclaimed Emperor by the troops based in the fortress. In 314 AD a bishop from York attended the Council at Arles to represent Christians from the province . While the Roman colonia and fortress were on high ground, by 400 AD
15008-574: The rebuilt castles, now in stone, are visible on either side of the River Ouse. The first stone minster church was badly damaged by fire in the uprising, and the Normans built a minster on a new site. Around the year 1080, Archbishop Thomas started building the cathedral that in time became the current Minster. In the 12th century, York started to prosper. In 1190, York Castle was the site of an infamous massacre of its Jewish inhabitants , in which at least 150 were murdered, although some authorities put
15142-610: The region of York between 8000 and 7000 BC, although it is not known whether their settlements were permanent or temporary. By the time of the Roman conquest of Britain , the area was occupied by a tribe known to the Romans as the Brigantes . The Brigantian tribal area initially became a Roman client state, but later its leaders became more hostile and the Roman Ninth Legion was sent north of
15276-454: The special property that it is conservative , which means that the path taken by the test charge is irrelevant: all paths between two specified points expend the same energy, and thus a unique value for potential difference may be stated. The volt is so strongly identified as the unit of choice for measurement and description of electric potential difference that the term voltage sees greater everyday usage. For practical purposes, defining
15410-464: The time of the 2011 UK census , compared with 137,505 in 2001. The population of the City of York (Local Authority) was 198,051 and its ethnic composition was 94.3% White, 1.2% Mixed, 3.4% Asian and 0.6% Black. York's elderly population (those 65 and over) was 16.9%, however only 13.2% were listed as retired. Also at the time of the 2001 UK census , the City of York had a total population of 181,094 of whom 93,957 were female and 87,137 were male. Of
15544-805: The time. After the First World War it took over the Cleveland and Durham County Electric Power Company , the Northern Counties Electricity Supply Company, Durham County Electric Power Company, and Tees Power Station Company. It also took over the assets of the Durham Collieries Electric Power Company and the Hexham & District Supply Company following their liquidations. NESCo opened North Tees Power Station in 1921 and Dunston B Power Station in 1933. In 1927,
15678-532: The title " The Right Honourable ", the others being the Lord Mayors of London , Bristol , Cardiff and Belfast . York is an ancient borough , and was reformed by the Municipal Corporations Act 1835 to form a municipal borough . It gained the status of a county borough in 1889, under the Local Government Act 1888 , and existed so until 1974, when, under the Local Government Act 1972 , it became
15812-573: The town vulnerable to attack and unprepared for battle. After it was conquered, the city was renamed from the Old English Eoforwic to Jorvik . It became the capital of Viking territory in Britain, and at its peak boasted more than 10,000 inhabitants. This was a population second only to London within Great Britain. Jorvik proved an important economic and trade centre for the Vikings. Norse coinage
15946-542: The town was victim to occasional flooding from the Rivers Ouse and Foss, and the population reduced. York declined in the post-Roman era, and was taken and settled by the Angles in the 5th century. Reclamation of parts of the town was initiated in the 7th century under King Edwin of Northumbria , and York became his chief city. The first wooden minster church was built in York for the baptism of Edwin in 627, according to
16080-418: The two forces of nature then known. The force on the compass needle did not direct it to or away from the current-carrying wire, but acted at right angles to it. Ørsted's words were that "the electric conflict acts in a revolving manner." The force also depended on the direction of the current, for if the flow was reversed, then the force did too. Ørsted did not fully understand his discovery, but he observed
16214-417: The vector direction of the field is the line of greatest slope of potential, and where the equipotentials lie closest together. Ørsted's discovery in 1821 that a magnetic field existed around all sides of a wire carrying an electric current indicated that there was a direct relationship between electricity and magnetism. Moreover, the interaction seemed different from gravitational and electrostatic forces,
16348-414: Was 88.4 millimetres (3.5 in). York's urbanised areas are surrounded by a green belt that restricts development in the rural areas and parts of surrounding villages, to preserve the setting and historic character of the city. The green belt surrounds nearly all of the city and its outer villages, extending out into North Yorkshire. The York urban area (built-up area) had a population of 153,717 at
16482-482: Was also a Celtic personal name, so Eburākon could also mean "the property of Eburos". Indeed, the 12th‑century chronicler Geoffrey of Monmouth , in his fictional account of the prehistoric kings of Britain, Historia Regum Britanniae , suggests the name derives from that of a pre-Roman city founded by the legendary king Ebraucus . The name was Latinised by the Romans as Eboracum or Eburacum , and
16616-452: Was built at the confluence of the Rivers Ouse and Foss on a terminal moraine left by the last ice age . During Roman times, the land surrounding the Ouse and Foss was marshy, making the site easy to defend. The city is prone to flooding from the River Ouse, and has an extensive network of flood defences with walls along the river, and a liftable barrier across the Foss where it joins the Ouse at
16750-544: Was created at the Jorvik mint, while archaeologists have found evidence of a variety of craft workshops around the town's central Coppergate area. These demonstrate that textile production, metalwork, carving, glasswork and jewellery-making were all practised in Jorvik. Materials from as far afield as the Persian Gulf have also been discovered, suggesting that the town was part of an international trading network. Under Viking rule
16884-485: Was discovered. On the arrival of Prince Rupert , with an army of 15,000 men, the siege was lifted. The Parliamentarians retreated some 6 miles (10 km) from York with Rupert in pursuit, before turning on his army and soundly defeating it at the Battle of Marston Moor . Of Rupert's 15,000 troops, 4,000 were killed and 1,500 captured. The siege was renewed and the city surrendered to Sir Thomas Fairfax on 15 July. Following
17018-543: Was forced to move within the field; they are however an imaginary concept with no physical existence, and the field permeates all the intervening space between the lines. Field lines emanating from stationary charges have several key properties: first, that they originate at positive charges and terminate at negative charges; second, that they must enter any good conductor at right angles, and third, that they may never cross nor close in on themselves. A hollow conducting body carries all its charge on its outer surface. The field
17152-519: Was in the midst of internecine struggles when the Vikings raided and captured York. As a thriving Anglo-Saxon metropolis and prosperous economic hub, York was a clear target for the Vikings. Led by Ivar the Boneless and Halfdan , Scandinavian forces attacked the town on All Saints' Day. Launching the assault on a holy day proved an effective tactical move – most of York's leaders were in the cathedral, leaving
17286-485: Was inhabited by 6,000 legionary soldiers. The site of the principia (HQ) of the fortress lies under the foundations of York Minster , and excavations in the undercroft have revealed part of the Roman structure and columns. The Emperors Hadrian , Septimius Severus , and Constantius I all held court in York during their various campaigns. During his stay 207–211 AD, the Emperor Severus proclaimed York capital of
17420-537: Was joined in 1869 by his brother the philanthropist Joseph . Another chocolate manufacturer, Terry's of York , was a major employer. By 1900, the railways and confectionery had become the city's two major industries. York was a centre of early photography , as described by Hugh Murray in his 1986 book Photographs and Photographers of York: The Early Years, 1844–79 . Photographers who had studios in York included William Hayes , William Pumphrey , and Augustus Mahalski who operated on Davygate and Low Petergate in
17554-471: Was recorded as Asian, at 1.9% of the population. The number of theft-from-a-vehicle offences and theft of a vehicle per 1,000 of the population was 8.8 and 2.7, compared to the English national average of 6.9 and 2.7 respectively. The number of sexual offences was 0.9, in line with the national average. The national average of violence against another person was 16.2 compared to the York average of 17.5. The figures for crime statistics were all recorded during
17688-671: Was rising. York's many elegant townhouses , such as the Lord Mayor's Mansion House and Fairfax House date from this period, as do the Assembly Rooms , the Theatre Royal , and the racecourse . The railway promoter George Hudson was responsible for bringing the railway to York in 1839. Although Hudson's career as a railway entrepreneur ended in disgrace and bankruptcy, his promotion of York over Leeds, and of his own railway company (the York and North Midland Railway ), helped establish York as
17822-527: Was roughly drawn down the city's Grainger Street, with NESCo supplying the area to the east and DisCo that to the west. NESCo opened its first power station, Pandon Dene , in 1890. Merz's son, Charles Hesterman Merz worked at the Pandon Dene station and became the company's Chief Consultant Engineer. Charles Merz's design company, Merz & McLellan , which he founded with William McLellan , undertook much of NESCo's design work from 1898 onward. They designed
17956-613: Was to displace Protestant rule by blowing up the Houses of Parliament while King James I , the entire Protestant, and even most of the Catholic aristocracy and nobility were inside. In 1644, during the Civil War , the Parliamentarians besieged York , and many medieval houses outside the city walls were lost. The barbican at Walmgate Bar was undermined and explosives laid, but the plot
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