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120-453: Insull was born on November 11, 1859, in London , the son of Insull Insull, a tradesman and lay preacher who was active in the temperance movement , and Emma Short. He was one of five siblings who survived to adulthood. His younger brother, Martin , became a major executive at Sam's companies. Insull's career began as an apprentice clerk for various local businesses at age 14. He went on to become

240-468: A Bronze Age bridge were found on the south River Thames foreshore, upstream from Vauxhall Bridge . Two of the timbers were radiocarbon dated to 1750–1285 BC. In 2010, foundations of a large timber structure, dated to 4800–4500 BC, were found on the Thames' south foreshore downstream from Vauxhall Bridge. Both structures are on the south bank of the Thames, where the now-underground River Effra flows into

360-644: A mechanical television station, W9XR, which began in 1929 after the company installed the first 50,000 watt radio transmitter in Chicago for its two radio stations. The Wall Street Crash of 1929 and ensuing Great Depression , caused the collapse of Insull's public utility holding company empire. When Insull's fortune started to fade, he sold both WENR and WBCN along with W9XR, to the National Broadcasting Company in March 1931. Two years after its purchase of

480-510: A rectifier , which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction. Direct current may be converted into alternating current via an inverter . Direct current has many uses, from the charging of batteries to large power supplies for electronic systems, motors, and more. Very large quantities of electrical energy provided via direct-current are used in smelting of aluminum and other electrochemical processes. It

600-533: A stenographer at Vanity Fair . Through a newspaper ad, the 19-year-old became the private secretary and bookkeeper to Colonel George Gouraud , the London representative of Thomas Edison's telephone companies. When he learned of a job with Edison in the United States , Insull indicated he would be glad to have it, provided it was as Thomas Edison's personal secretary. In 1881, at the age of 21, Insull immigrated to

720-450: A 56-year-old millionairess playing a gleeful 18-year-old, the whole production bought for her like a trinket by a man Herman knew to be an unscrupulous manipulator. Herman began to write: "Miss Gladys Wallis, an aging, hopelessly incompetent amateur, opened last night in ..." Then Herman passed out, slumped over the top of his typewriter. Mankiewicz resurrected the experience in writing the screenplay for Citizen Kane , incorporating it into

840-537: A DC circuit. However, most such circuits have a DC solution. This solution gives the circuit voltages and currents when the circuit is in DC steady state . Such a circuit is represented by a system of differential equations . The solution to these equations usually contain a time varying or transient part as well as constant or steady state part. It is this steady state part that is the DC solution. There are some circuits that do not have

960-407: A DC solution. Two simple examples are a constant current source connected to a capacitor and a constant voltage source connected to an inductor. In electronics, it is common to refer to a circuit that is powered by a DC voltage source such as a battery or the output of a DC power supply as a DC circuit even though what is meant is that the circuit is DC powered. In a DC circuit, a power source (e.g.

1080-450: A battery system to ensure power is maintained for subscriber lines during power interruptions. Other devices may be powered from the telecommunications DC system using a DC-DC converter to provide any convenient voltage. Many telephones connect to a twisted pair of wires, and use a bias tee to internally separate the AC component of the voltage between the two wires (the audio signal) from

1200-423: A battery, capacitor, etc.) has a positive and negative terminal, and likewise, the load also has a positive and negative terminal. To complete the circuit, positive charges need to flow from the power source to the load. The charges will then return to the negative terminal of the load, which will then flow back to the negative terminal of the battery, completing the circuit. If either the positive or negative terminal

1320-437: A demand metered billing system, measuring not only total power consumption, but a set of rates for low-demand and high-demand electric use times. By 1897, Insull had worked out his formulas enough to offer Chicago electric customers two-tiered electric rates. With the new system, many homeowners found their bills lowered by 32% within a year. In 1896, Insull became a US citizen. In 1897, he incorporated another electric utility,

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1440-524: A direct current source . The DC solution of an electric circuit is the solution where all voltages and currents are constant. Any stationary voltage or current waveform can be decomposed into a sum of a DC component and a zero-mean time-varying component; the DC component is defined to be the expected value, or the average value of the voltage or current over all time. Although DC stands for "direct current", DC often refers to "constant polarity". Under this definition, DC voltages can vary in time, as seen in

1560-541: A furnished suite at the Civic Opera House. The Insulls had one son, Samuel Jr. Both husband and wife were patrons of the arts. Because of this Insull was instrumental in the building of Chicago's Civic Opera House , which opened November 4, 1929, with Aida . The opera and its cast were chosen by Insull. Samuel Insull was also known for his charitable works in other areas, donating large sums of money to local hospitals, then calling on others with similar resources to do

1680-529: A larger area, similar in size to Greater London, although some outer districts are excluded and some just outside included. The Greater London boundary has been aligned to the M25 motorway in places. Further urban expansion is now prevented by the Metropolitan Green Belt , although the built-up area extends beyond the boundary in places, producing a separately defined Greater London Urban Area . Beyond this

1800-417: A monopoly, he kept his prices low and campaigned vigorously for regulation. Often regarded as a fictionalized biography of William Randolph Hearst , Orson Welles 's film Citizen Kane is, in part, inspired by the life of Samuel Insull. "It was a real man who built an opera house for the soprano of his choice, and much in the movie was borrowed from that story," Welles wrote. Welles gave Maurice Seiderman

1920-452: A photograph of Insull, with mustache, to use as a model for the makeup design of the old Charles Foster Kane. Welles denied that the character of Susan Alexander was based on Gladys Wallis, but co-writer Herman J. Mankiewicz did incorporate a related experience into the script. In June 1925, after a 26-year absence, Gladys Wallis Insull returned to the stage in a charity revival of The School for Scandal that ran two weeks in Chicago. When

2040-403: A population density of 802 per acre (325 per hectare). In addition to the growing number of stores selling goods, such as Harding, Howell & Co. —one of the first department stores —located on Pall Mall , the streets had scores of street sellers . London's overcrowded conditions led to cholera epidemics, claiming 14,000 lives in 1848, and 6,000 in 1866. Rising traffic congestion led to

2160-549: A population of 7,172,036 in 2001 and a population density of 11,760 inhabitants per square mile (4,542/km ). The extended area known as the London Metropolitan Region or the London Metropolitan Agglomeration, comprises a total area of 3,236 square miles (8,382 km ) has a population of 13,709,000 and a population density of 3,900 inhabitants per square mile (1,510/km ). Modern London stands on

2280-564: A post- Brexit exodus of stock listings from the London Stock Exchange , London remains a European economic powerhouse, and one of the world's major financial centres . It hosts Europe's largest concentration of higher education institutions , some of which are the highest-ranked academic institutions in the world: Imperial College London in natural and applied sciences , the London School of Economics in social sciences , and

2400-542: A temperate oceanic climate ( Köppen : Cfb ). Rainfall records have been kept in the city since at least 1697, when records began at Kew . At Kew, the most rainfall in one month is 7.4 inches (189 mm) in November 1755 and the least is 0 inches (0 mm) in both December 1788 and July 1800. Mile End also had 0 inches (0 mm) in April 1893. The wettest year on record is 1903, with a total fall of 38.1 inches (969 mm) and

2520-690: Is 1,049.8 millibars (31.00 inHg) on 20 January 2020. Summers are generally warm, sometimes hot. London's average July high is 23.5 °C (74.3 °F). On average each year, London experiences 31 days above 25 °C (77.0 °F) and 4.2 days above 30.0 °C (86.0 °F). During the 2003 European heat wave , prolonged heat led to hundreds of heat-related deaths. A previous spell of 15 consecutive days above 32.2 °C (90.0 °F) in England in 1976 also caused many heat related deaths. A previous temperature of 37.8 °C (100.0 °F) in August 1911 at

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2640-607: Is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors , insulators , or even through a vacuum as in electron or ion beams . The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current . The abbreviations AC and DC are often used to mean simply alternating and direct , as when they modify current or voltage . Direct current may be converted from an alternating current supply by use of

2760-554: Is agreed that the name came into these languages from Common Brythonic ; recent work tends to reconstruct the lost Celtic form of the name as * Londonjon or something similar. This was then adapted into Latin as Londinium and borrowed into Old English. Until 1889, the name "London" applied officially only to the City of London , but since then it has also referred to the County of London and to Greater London . In 1993, remains of

2880-554: Is also used for some railways , especially in urban areas . High-voltage direct current is used to transmit large amounts of power from remote generation sites or to interconnect alternating current power grids. Direct current was produced in 1800 by Italian physicist Alessandro Volta 's battery, his Voltaic pile . The nature of how current flowed was not yet understood. French physicist André-Marie Ampère conjectured that current travelled in one direction from positive to negative. When French instrument maker Hippolyte Pixii built

3000-482: Is an AC device which uses a rectifier to produce DC for battery charging. Most highway passenger vehicles use nominally 12  V systems. Many heavy trucks, farm equipment, or earth moving equipment with Diesel engines use 24 volt systems. In some older vehicles, 6 V was used, such as in the original classic Volkswagen Beetle . At one point a 42 V electrical system was considered for automobiles, but this found little use. To save weight and wire, often

3120-435: Is commonly found in many extra-low voltage applications and some low-voltage applications, especially where these are powered by batteries or solar power systems (since both can produce only DC). Most electronic circuits or devices require a DC power supply . Domestic DC installations usually have different types of sockets , connectors , switches , and fixtures from those suitable for alternating current. This

3240-427: Is disconnected, the circuit will not be complete and the charges will not flow. In some DC circuit applications, polarity does not matter, which means you can connect positive and negative backwards and the circuit will still be complete and the load will still function normally. However, in most DC applications, polarity does matter, and connecting the circuit backwards will result in the load not working properly. DC

3360-412: Is distributed to a substation, which utilizes a rectifier to convert the power to direct current. The term DC is used to refer to power systems that use only one electrical polarity of voltage or current, and to refer to the constant, zero-frequency, or slowly varying local mean value of a voltage or current. For example, the voltage across a DC voltage source is constant as is the current through

3480-528: Is formed of two tiers: a citywide, strategic tier and a local tier. Citywide administration is coordinated by the Greater London Authority (GLA), while local administration is carried out by 33 smaller authorities. The GLA consists of two elected components: the mayor of London , who has executive powers , and the London Assembly , which scrutinises the mayor's decisions and can accept or reject

3600-689: Is headquartered in Thames House on the north bank of the River Thames and the foreign intelligence service ( MI6 ) is headquartered in the SIS Building on the south bank. Crime rates vary widely across different areas of London. Crime figures are made available nationally at Local Authority and Ward level. In 2015, there were 118 homicides, a 25.5% increase over 2014. Recorded crime has been rising in London, notably violent crime and murder by stabbing and other means have risen. There were 50 murders from

3720-572: Is held by an independent . The ministerial post of minister for London was created in 1994, however as of 2024, the post has been vacant. Policing in Greater London, with the exception of the City of London , is provided by the Metropolitan Police ("The Met"), overseen by the mayor through the Mayor's Office for Policing and Crime (MOPAC). The Met is also referred to as Scotland Yard after

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3840-553: Is known as London . It is the capital of the United Kingdom and of England by convention rather than statute. The capital of England was moved to London from Winchester as the Palace of Westminster developed in the 12th and 13th centuries to become the permanent location of the royal court , and thus the political capital of the nation. Greater London encompasses a total area of 611 square miles (1,583 km ) an area which had

3960-447: Is mostly due to the lower voltages used, resulting in higher currents to produce the same amount of power . It is usually important with a DC appliance to observe polarity, unless the device has a diode bridge to correct for this. Most automotive applications use DC. An automotive battery provides power for engine starting, lighting, the ignition system, the climate controls, and the infotainment system among others. The alternator

4080-551: Is sometimes wrongly credited with the invention of the holding company .) His holding company collapsed during the Great Depression , wiping out the life savings of 600,000 shareholders. The collapse along with the ongoing National Electric Light Association's Federal Trade Commission Investigation of the electric industry led to the enactment of the Public Utility Holding Company Act of 1935 . Insull fled

4200-669: Is the capital and largest city of both England and the United Kingdom , with a population of 8,866,180 in 2022. The wider metropolitan area is the largest in Western Europe , with a population of 14.9 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) estuary down to the North Sea , and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre ,

4320-523: Is the vast London commuter belt . Greater London is split for some purposes into Inner London and Outer London , and by the River Thames into North and South , with an informal central London area. The coordinates of the nominal centre of London, traditionally the original Eleanor Cross at Charing Cross near the junction of Trafalgar Square and Whitehall , are about 51°30′26″N 00°07′39″W  /  51.50722°N 0.12750°W  / 51.50722; -0.12750 . Within London, both

4440-512: The 2012 Summer Olympics . London is an ancient name, attested in the first century AD, usually in the Latinised form Londinium . Modern scientific analyses of the name must account for the origins of the different forms found in early sources: Latin (usually Londinium ), Old English (usually Lunden ), and Welsh (usually Llundein ), with reference to the known developments over time of sounds in those different languages. It

4560-529: The Black Death in the mid-14th century, London lost nearly a third of its population. London was the focus of the Peasants' Revolt in 1381. London was a centre of England's Jewish population before their expulsion by Edward I in 1290. Violence against Jews occurred in 1190, when it was rumoured that the new king had ordered their massacre after they had presented themselves at his coronation. In 1264 during

4680-520: The Canary Wharf development. This was born out of London's increasing role as an international financial centre in the 1980s. Located about 2 miles (3 km) east of central London, the Thames Barrier was completed in the 1980s to protect London against tidal surges from the North Sea . The Greater London Council was abolished in 1986, leaving London with no central administration until 2000 and

4800-676: The Chicago North Shore and Milwaukee Railroad , Chicago Rapid Transit Company , Chicago Aurora and Elgin Railroad , Gary Railways , and Chicago South Shore and South Bend Railroad . He helped modernize these railroads and others. As a result of owning these diverse companies, Insull is credited with being one of the early proponents for regulation of industry. He saw that federal and state regulation would recognize electric utilities as natural monopolies , allowing them to grow with little competition and to sell electricity to broader segments of

4920-497: The City of London , was founded by the Romans as Londinium and has retained its medieval boundaries. The City of Westminster , to the west of the City of London, has been the centuries-long host of the national government and parliament . London grew rapidly in the 19th century , becoming the world's largest city at the time . Since the 19th century, the name "London" has referred to

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5040-648: The Corn Laws in 1846 was specifically aimed at weakening Dutch economic power. London then overtook Amsterdam as the leading international financial centre. With the onset of the Industrial Revolution in Britain, an unprecedented growth in urbanisation took place, and the number of High Streets (the primary street for retail in Britain) rapidly grew. London was the world's largest city from about 1831 to 1925 , with

5160-553: The Georgian era , new districts such as Mayfair were formed in the west; new bridges over the Thames encouraged development in South London . In the east, the Port of London expanded downstream. London's development as an international financial centre matured for much of the 18th century. In 1762, George III acquired Buckingham House , which was enlarged over the next 75 years. During

5280-609: The King's Road , Chelsea and Carnaby Street . The role of trendsetter revived in the punk era. In 1965 London's political boundaries were expanded in response to the growth of the urban area and a new Greater London Council was created. During The Troubles in Northern Ireland, London was hit from 1973 by bomb attacks by the Provisional Irish Republican Army . These attacks lasted for two decades, starting with

5400-600: The London Ambulance Service (LAS) NHS Trust , the largest free-at-the-point-of-use emergency ambulance service in the world. The London Air Ambulance charity operates in conjunction with the LAS where required. Her Majesty's Coastguard and the Royal National Lifeboat Institution operate on the River Thames , which is under the jurisdiction of the Port of London Authority from Teddington Lock to

5520-748: The Mediterranean was normally through Antwerp and over the Alps ; any ships passing through the Strait of Gibraltar to or from England were likely to be Italian or Ragusan . The reopening of the Netherlands to English shipping in January 1565 spurred a burst of commercial activity. The Royal Exchange was founded. Mercantilism grew and monopoly traders such as the East India Company were founded as trade expanded to

5640-594: The New Model Army entered London in 1647, and they were levelled by Parliament the same year. London was plagued by disease in the early 17th century, culminating in the Great Plague of 1665–1666, which killed up to 100,000 people, or a fifth of the population. The Great Fire of London broke out in 1666 in Pudding Lane in the city and quickly swept through the wooden buildings. Rebuilding took over ten years and

5760-554: The New World . London became the main North Sea port, with migrants arriving from England and abroad. The population rose from about 50,000 in 1530 to about 225,000 in 1605. In the 16th century, William Shakespeare and his contemporaries lived in London during English Renaissance theatre . Shakespeare's Globe Theatre was constructed in 1599 in Southwark . Stage performances came to a halt in London when Puritan authorities shut down

5880-590: The Old Bailey bombing . Racial inequality was highlighted by the 1981 Brixton riot . Greater London's population declined in the decades after the Second World War, from an estimated peak of 8.6 million in 1939 to around 6.8 million in the 1980s. The principal ports for London moved downstream to Felixstowe and Tilbury , with the London Docklands area becoming a focus for regeneration, including

6000-637: The Second Barons' War , Simon de Montfort 's rebels killed 500 Jews while attempting to seize records of debts. During the Tudor period , the Reformation produced a gradual shift to Protestantism . Much of London property passed from church to private ownership, which accelerated trade and business in the city. In 1475, the Hanseatic League set up a main trading base ( kontor ) of England in London, called

6120-568: The Stalhof or Steelyard . It remained until 1853, when the Hanseatic cities of Lübeck , Bremen and Hamburg sold the property to South Eastern Railway . Woollen cloth was shipped undyed and undressed from 14th/15th century London to the nearby shores of the Low Countries . Yet English maritime enterprise hardly reached beyond the seas of north-west Europe . The commercial route to Italy and

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6240-543: The Thames , its primary geographical feature, a navigable river which crosses the city from the south-west to the east. The Thames Valley is a flood plain surrounded by gently rolling hills including Parliament Hill , Addington Hills , and Primrose Hill . Historically London grew up at the lowest bridging point on the Thames. The Thames was once a much broader, shallower river with extensive marshlands ; at high tide, its shores reached five times their present width. Since

6360-637: The Tower of London ; the site featuring the Palace of Westminster , Church of St. Margaret , and Westminster Abbey ; and the historic settlement in Greenwich where the Royal Observatory defines the prime meridian (0° longitude ) and Greenwich Mean Time . Other landmarks include Buckingham Palace , the London Eye , Piccadilly Circus , St Paul's Cathedral , Tower Bridge , and Trafalgar Square . The city has

6480-521: The Victorian era the Thames has been extensively embanked , and many of its London tributaries now flow underground . The Thames is a tidal river, and London is vulnerable to flooding. The threat has increased over time because of a slow but continuous rise in high water level caused by climate change and by the slow 'tilting' of the British Isles as a result of post-glacial rebound . London has

6600-562: The metropolis around the City of London, historically split between the counties of Middlesex , Essex , Surrey , Kent , and Hertfordshire , which since 1965 has largely comprised the administrative area of Greater London , governed by 33 local authorities and the Greater London Authority . As one of the world's major global cities , London exerts a strong influence on world art , entertainment, fashion , commerce, finance, education , healthcare , media , science, technology, tourism , transport , and communications. Despite

6720-420: The regulated monopoly , a uniquely American institution that included utility companies. This came from a combination of his business persona and his political one. On the one hand, he abhorred the waste of competing power producers, whose inefficiency would often double the cost of production. On the other hand, he believed in the citizen's right to fair treatment. So while he bought up rival companies and created

6840-554: The 11th century, London was clearly the largest town in England. Westminster Abbey , rebuilt in Romanesque style by King Edward the Confessor , was one of the grandest churches in Europe. Winchester had been the capital of Anglo-Saxon England , but from this time London became the main forum for foreign traders and the base for defence in time of war. In the view of Frank Stenton : "It had

6960-494: The 18th century, London was said to be dogged by crime, and the Bow Street Runners were established in 1750 as a professional police force. Epidemics during the 1720s and 30s saw most children born in the city die before reaching their fifth birthday. Coffee-houses became a popular place to debate ideas, as growing literacy and development of the printing press made news widely available, with Fleet Street becoming

7080-420: The City of London and the City of Westminster have city status . The City of London and the remainder of Greater London are both counties for the purposes of lieutenancies . The area of Greater London includes areas that are part of the historic counties of Middlesex , Kent , Surrey , Essex and Hertfordshire . More recently, Greater London has been defined as a region of England and in this context

7200-542: The Commonwealth Electric Light & Power Co. In 1907, Insull's two companies formally merged to create the Commonwealth Edison Co. During a Chicago meeting on October 8, 1918, he introduced Professor Thomas Garrigue Masaryk as the president of the future Czechoslovak Republic, de facto. As more people became connected to the electric grid, Insull's company, which had an exclusive franchise from

7320-448: The DC component of the voltage between the two wires (used to power the phone). High-voltage direct current (HVDC) electric power transmission systems use DC for the bulk transmission of electrical power, in contrast with the more common alternating current systems. For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. Applications using fuel cells (mixing hydrogen and oxygen together with

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7440-604: The Great Lakes Broadcasting Company in 1927 and purchased Chicago radio stations WENR and WBCN; the two stations were merged on June 1, 1927, with Insull paying a million dollars for WENR alone. Insull moved the stations first into the Strauss Building, then into Insull's Civic Opera House , where WENR became an affiliate of the NBC Blue Network . Insull's Great Lakes Broadcasting Company also included

7560-497: The Greenwich station was later disregarded as non-standard. Droughts can also, occasionally, be a problem, especially in summer, most recently in summer 2018, and with much drier than average conditions prevailing from May to December. However, the most consecutive days without rain was 73 days in the spring of 1893. Direct current Direct current ( DC ) is one-directional flow of electric charge . An electrochemical cell

7680-627: The Insulls visited Paris to see the Bastille Day festivities. Insull suffered from a heart ailment, and his wife Gladys had asked him not to take the Métro because it was bad for his heart. Nevertheless, Insull had made frequent declarations that he was "now a poor man" and on July 16, 1938, he descended a long flight of stairs at the Place de la Concorde station . He died of a heart attack just as he stepped toward

7800-435: The London area. This called for the Corporation of the city to extend its jurisdiction and administration over expanding areas around the city. Fearing an attempt by the Crown to diminish the Liberties of London , coupled with a lack of interest in administering these additional areas or concern by city guilds of having to share power, caused the Corporation's "The Great Refusal", a decision which largely continues to account for

7920-409: The Thames. Despite the evidence of scattered Brythonic settlements in the area, the first major settlement was founded by the Romans around 47 AD, about four years after their invasion of 43 AD. This only lasted until about 61 AD, when the Iceni tribe led by Queen Boudica stormed it and burnt it to the ground. The next planned incarnation of Londinium prospered, superseding Colchester as

8040-450: The US, complete with side whiskers to make him appear older than his years. In the decade that followed, Insull took on increasing responsibilities in Edison's business endeavors, building electrical power stations throughout the US. With several other Edison Pioneers , he participated in Henry Villard's January 1889 founding of Edison General Electric, which later became the publicly held company known as General Electric . In 1892, Insull

8160-415: The United Kingdom's population and over 16% of England's population. The Greater London Built-up Area is the fourth-most populous in Europe, with about 9.8 million inhabitants as of 2011. The London metropolitan area is the third-most populous in Europe, with about 14 million inhabitants as of 2016, making London a megacity . Four World Heritage Sites are located in London: Kew Gardens ;

8280-405: The Viking incursions formally agreed by the Danish warlord , Guthrum and the West Saxon king Alfred the Great in 886. The Anglo-Saxon Chronicle records that Alfred "refounded" London in 886. Archaeological research shows this involved abandonment of Lundenwic and a revival of life and trade within the old Roman walls . London then grew slowly until a dramatic increase in about 950. By

8400-409: The cataract's flow, but was thwarted by conservation interests and the Kentucky legislature. Samuel Insull also had interests in broadcasting. Through his long association with Chicago's Civic Opera , he thought the new medium of radio broadcasting would be a way to bring opera performances into people's homes. On hearing of the work of Westinghouse to establish a radio station in Chicago, he contacted

8520-437: The centre of the British press. The invasion of Amsterdam by Napoleonic armies led many financiers to relocate to London and the first London international issue was arranged in 1817. Around the same time, the Royal Navy became the world's leading war fleet, acting as a major deterrent to potential economic adversaries. Following a fire in 1838, the Royal Exchange was redesigned by William Tite and rebuilt in 1844. The repeal of

8640-407: The circuit voltages and currents are independent of time. A particular circuit voltage or current does not depend on the past value of any circuit voltage or current. This implies that the system of equations that represent a DC circuit do not involve integrals or derivatives with respect to time. If a capacitor or inductor is added to a DC circuit, the resulting circuit is not, strictly speaking,

8760-478: The city's metropolis. The City of London at its core once comprised the whole settlement, but as its urban area grew, the Corporation of London resisted attempts to amalgamate the city with its suburbs , causing "London" to be defined several ways. Forty per cent of Greater London is covered by the London post town , in which 'London' forms part of postal addresses. The London telephone area code (020) covers

8880-532: The city, grew steadily. By 1920, when it used more than two million tons of coal annually, the company's 6,000 employees served about 500,000 customers. Annual revenues reached nearly $ 40 million. During the 1920s, its largest generating stations included the Fisk Generating Station and Crawford Station , both on the Sanitary and Ship Canal . Insull began purchasing portions of the utility infrastructure of

9000-412: The city, to intimidate the inhabitants. In 1097, William II began building Westminster Hall , near the abbey. It became the basis of a new Palace of Westminster . In the 12th century, the institutions of central government, which had hitherto followed the royal English court around the country, grew in size and sophistication and became increasingly fixed, for most purposes at Westminster , although

9120-583: The city. When it became clear that Westinghouse 's support of alternating current would win over Edison's direct current , Insull switched his support to AC in the war of the currents . His Chicago area holdings later included Federal Signal Corporation , Commonwealth Edison , Peoples Gas , and the Northern Indiana Public Service Company , and held shares of many more utilities. Insull also owned significant portions of many railroads, mainly electric interurban lines, including

9240-588: The combined revenue expenditure by London councils and the GLA amounted to just over £22 billion (£14.7 billion for the boroughs and £7.4 billion for the GLA). The London Fire Brigade is the statutory fire and rescue service for Greater London, run by the London Fire and Emergency Planning Authority . It is the third largest fire service in the world. National Health Service ambulance services are provided by

9360-618: The company. Together the two companies arranged for a radio station to be built in Chicago which would be operated jointly by Commonwealth Edison and Westinghouse. KYW 's first home was the roof of the Edison Company building at 72 West Adams Street in Chicago, and it went on the air November 11, 1921. It was Chicago's first radio station. Though the partnership came to an end in 1926, with Westinghouse buying out Edison's interest in KYW, Insull's interest in broadcasting did not stop there. He formed

9480-405: The comprehensive University College London . It is the most visited city in Europe and has the world's busiest city airport system . The London Underground is the world's oldest rapid transit system. London's diverse cultures encompass over 300 languages. The 2023 population of Greater London of just under 10 million made it Europe's third-most populous city , accounting for 13.4% of

9600-538: The country, initially to France. When the United States asked French authorities that he be extradited, Insull moved to Greece, where there was not yet an extradition treaty with the US. He was later arrested and extradited to the United States by Turkey in 1934 to face federal prosecution on mail fraud and antitrust charges. He was defended by Chicago lawyer Floyd Thompson and found not guilty on all counts. In July 1938,

9720-612: The creation of the Greater London Authority . To mark the 21st century, the Millennium Dome , London Eye and Millennium Bridge were constructed. On 6 July 2005 London was awarded the 2012 Summer Olympics , as the first city to stage the Olympic Games three times. On 7 July 2005, three London Underground trains and a double-decker bus were bombed in a series of terrorist attacks . In 2008, Time named London alongside New York City and Hong Kong as Nylonkong , hailing them as

9840-542: The creation of the London Underground , the world's first urban rail network . The Metropolitan Board of Works oversaw infrastructure expansion in the capital and some surrounding counties; it was abolished in 1889 when the London County Council was created out of county areas surrounding the capital. From the early years of the 20th century onwards, teashops were found on High Streets across London and

9960-713: The driest is 1921, with a total fall of 12.1 inches (308 mm). The average annual precipitation amounts to about 600mm, which is half the annual rainfall of New York City . Despite relatively low annual precipitation, London receives 109.6 rainy days on the 1.0mm threshold annually. London is vulnerable to climate change , and there is concern among hydrological experts that households may run out of water before 2050. Temperature extremes in London range from 40.2 °C (104.4 °F) at Heathrow on 19 July 2022 down to −17.4 °C (0.7 °F) at Northolt on 13 December 1981. Records for atmospheric pressure have been kept at London since 1692. The highest pressure ever reported

10080-603: The first Muslim mayor of a major Western capital. The mayor's statutory planning strategy is published as the London Plan , which was most recently revised in 2011. The local authorities are the councils of the 32 London boroughs and the City of London Corporation . They are responsible for most local services, such as local planning, schools, libraries, leisure and recreation, social services , local roads and refuse collection. Certain functions, such as waste management , are provided through joint arrangements. In 2009–2010

10200-654: The first dynamo electric generator in 1832, he found that as the magnet used passed the loops of wire each half turn, it caused the flow of electricity to reverse, generating an alternating current . At Ampère's suggestion, Pixii later added a commutator , a type of "switch" where contacts on the shaft work with "brush" contacts to produce direct current. The late 1870s and early 1880s saw electricity starting to be generated at power stations . These were initially set up to power arc lighting (a popular type of street lighting) running on very high voltage (usually higher than 3,000 volts) direct current or alternating current. This

10320-658: The infusion of capital, from the Vanderbilts , from J. P. Morgan, and others, as necessary for the company's future development. Edison forgave him, but others did not, and it seemed a good idea to move on to a new company in a new place. The Western Edison Light Co. was founded in Chicago in 1882, three years after Edison developed a practical light bulb. In 1887, Western Edison became the Chicago Edison Co. Insull left General Electric and moved to Chicago in 1892, where he became president of Chicago Edison that year. Chicago Edison

10440-622: The location of its original headquarters in a road called Great Scotland Yard in Whitehall. The City of London has its own police force – the City of London Police . First worn by Met police officers in 1863, the custodian helmet has been called a "cultural icon" and a "symbol of British law enforcement". Introduced by the Met in 1929, the blue police telephone box (basis for the TARDIS in Doctor Who )

10560-595: The market. At the same time, a regulated monopoly could keep costs down by eliminating duplication of infrastructure by competing companies, while prices could be kept to reasonable rates by regulators. He used economies of scale to overcome market barriers by cheaply producing electricity with large steam turbines, such as the installations in the 1929 State Line Generating Plant in Hammond, Indiana. This made it easier to put electricity into homes. As part of his drive to efficiency, Insull practiced vertical integration . Coal

10680-409: The mayor's budget proposals each year. The GLA has responsibility for the majority of London's transport system through its functional arm Transport for London (TfL), it is responsible for overseeing the city's police and fire services, and also for setting a strategic vision for London on a range of issues. The headquarters of the GLA is City Hall , Newham. The mayor since 2016 has been Sadiq Khan ,

10800-512: The metal frame of the vehicle is connected to one pole of the battery and used as the return conductor in a circuit. Often the negative pole is the chassis "ground" connection, but positive ground may be used in some wheeled or marine vehicles. In a battery electric vehicle , there are usually two separate DC systems. The "low voltage" DC system typically operates at 12V, and serves the same purpose as in an internal combustion engine vehicle. The "high voltage" system operates at 300-400V (depending on

10920-718: The most museums , art galleries, libraries, and cultural venues in the UK, including the British Museum , National Gallery , Natural History Museum , Tate Modern , British Library , and numerous West End theatres. Important sporting events held in London include the FA Cup Final , the Wimbledon Tennis Championships , and the London Marathon . It became the first city to host three Summer Olympic Games upon hosting

11040-650: The most diverse cities in the world. In 1951, the Festival of Britain was held on the South Bank . The Great Smog of 1952 led to the Clean Air Act 1956 , which ended the " pea soup fogs " for which London had been notorious, and had earned it the nickname the "Big Smoke". Starting mainly in the mid-1960s, London became a centre for worldwide youth culture , exemplified by the Swinging London sub-culture associated with

11160-499: The narrative of drama critic Jedediah Leland . After Kane's second wife makes her catastrophic opera debut, Leland returns to the press room and passes out over the top of his typewriter after writing the first sentence of his review: "Miss Susan Alexander , a pretty but hopelessly incompetent amateur ..." Tom Holland plays Insull in the 2019 historical drama film The Current War . [REDACTED] Media related to Samuel Insull at Wikimedia Commons London London

11280-467: The old Roman city. By about 680 the city had become a major port again, but there is little evidence of large-scale production. From the 820s repeated Viking assaults brought decline. Three are recorded; those in 851 and 886 succeeded, while the last, in 994, was rebuffed. The Vikings applied Danelaw over much of eastern and northern England, its boundary running roughly from London to Chester as an area of political and geographical control imposed by

11400-462: The performance was repeated on Broadway in October 1925, Herman J. Mankiewicz – then the third-string theatre critic for The New York Times – was assigned to review the production. After her opening-night performance in the role of Lady Teazle, drama critic Mankiewicz returned to the press room "full of fury and too many drinks", wrote biographer Richard Meryman : He was outraged by the spectacle of

11520-569: The play For Money in 1892 and in his subsequent productions. Gladys played the role of Maggie Rolan in Brother John (1893); a New York Times reviewer listed her as one of the most popular players, one who "deserved quite all the applause [she] received." Prior to her marriage to Insull, Gladys also appeared on the New York stage in On Probation and Worth a Million . At the height of her fame she

11640-486: The principal city of the Roman province of Britannia in 100. At its height in the 2nd century, Roman London had a population of about 60,000. With the early 5th-century collapse of Roman rule, the walled city of Londinium was effectively abandoned, although Roman civilisation continued around St Martin-in-the-Fields until about 450. From about 500, an Anglo-Saxon settlement known as Lundenwic developed slightly west of

11760-466: The radio stations and the mechanical television station, NBC shut W9XR just as it had done with W9XAP, which came with its purchase of WMAQ (AM) . On May 22, 1899, Samuel Insull married a "tiny, exquisitely beautiful and clever" Broadway ingénue actress whose stage name was (Alis) Gladys Wallis (1875–September 23, 1953). Her real name was Margaret Anna Bird. Gladys Wallis was popular with New York audiences and appeared in W. H. Crane's company first in

11880-428: The raw output of a rectifier or the fluctuating voice signal on a telephone line. Some forms of DC (such as that produced by a voltage regulator ) have almost no variations in voltage , but may still have variations in output power and current. A direct current circuit is an electrical circuit that consists of any combination of constant voltage sources, constant current sources, and resistors . In this case,

12000-462: The resources, and it was rapidly developing the dignity and the political self-consciousness appropriate to a national capital ." After winning the Battle of Hastings , William, Duke of Normandy was crowned King of England in newly completed Westminster Abbey on Christmas Day 1066. William built the Tower of London , the first of many such in England rebuilt in stone in the south-eastern corner of

12120-624: The rest of Britain, with Lyons , who opened the first of their chain of teashops in Piccadilly in 1894, leading the way. The tearooms, such as the Criterion in Piccadilly, became a popular meeting place for women from the suffrage movement. The city was the target of many attacks during the suffragette bombing and arson campaign , between 1912 and 1914, which saw historic landmarks such as Westminster Abbey and St Paul's Cathedral bombed. London

12240-401: The royal treasury came to rest in the Tower . While the City of Westminster developed into a true governmental capital, its distinct neighbour, the City of London , remained England's largest city and principal commercial centre and flourished under its own unique administration, the Corporation of London . In 1100, its population was some 18,000; by 1300 it had grown to nearly 100,000. With

12360-496: The same. He donated freely to African-American charities in Chicago, asking the wealthy to follow his example. At the time the US entered WWI, Insull was named head of the Illinois Defense Council by President Woodrow Wilson ; his efforts sold over a million dollars of War Bonds. Insull controlled an empire of $ 500 million with only $ 27 million in equity. (Due to the highly leveraged structure of Insull's holdings, he

12480-534: The sea. London is the seat of the Government of the United Kingdom . Many government departments, as well as the prime minister's residence at 10 Downing Street , are based close to the Palace of Westminster , particularly along Whitehall . There are 75 members of Parliament (MPs) from London; As of June 2024 , 59 are from the Labour Party , 9 are Conservatives , 6 are Liberal Democrats and one constituency

12600-424: The start of 2018 to mid April 2018. Funding cuts to police in London are likely to have contributed to this, though other factors are involved. However, homicide figures fell in 2022 with 109 recorded for the year, and the murder rate in London is much lower than other major cities around the world. London, also known as Greater London , is one of nine regions of England and the top subdivision covering most of

12720-725: The theatres in the 1640s. The ban on theatre was lifted during the Restoration in 1660, and London's oldest operating theatre, Drury Lane , opened in 1663 in what is now the West End theatre district. By the end of the Tudor period in 1603, London was still compact. There was an assassination attempt on James I in Westminster, in the Gunpowder Plot of 5 November 1605. In 1637, the government of Charles I attempted to reform administration in

12840-558: The ticket taker. He had 30 francs in his pocket at the time and was identified by a hotel laundry bill in his pocket. Insull was receiving an annual pension totaling $ 21,000 from three of his former companies when he died. Insull was buried near his parents on July 23, 1938, in Putney Vale Cemetery , London, the city of his birth. His estate was found to be worth about $ 1,000 and his debts totaled $ 14,000,000, according to his will. Insull's legacies included electricity grid systems and

12960-691: The unique governmental status of the City . In the English Civil War , the majority of Londoners supported the Parliamentary cause. After an initial advance by the Royalists in 1642, culminating in the battles of Brentford and Turnham Green , London was surrounded by a defensive perimeter wall known as the Lines of Communication . The lines were built by up to 20,000 people, and were completed in under two months. The fortifications failed their only test when

13080-464: The vehicle), and provides the power for the traction motors . Increasing the voltage for the traction motors reduces the current flowing through them, increasing efficiency. Telephone exchange communication equipment uses standard −48 V DC power supply. The negative polarity is achieved by grounding the positive terminal of power supply system and the battery bank. This is done to prevent electrolysis depositions. Telephone installations have

13200-625: The world's three most influential global cities . In January 2015, Greater London's population was estimated to be 8.63 million, its highest since 1939. During the Brexit referendum in 2016, the UK as a whole decided to leave the European Union , but most London constituencies voted for remaining. However, Britain's exit from the EU in early 2020 only marginally weakened London's position as an international financial centre. The administration of London

13320-1014: Was bombed by the Germans in the First World War , and during the Second World War , the Blitz and other bombings by the German Luftwaffe killed over 30,000 Londoners, destroying large tracts of housing and other buildings across the city. The tomb of the Unknown Warrior , an unidentified member of the British armed forces killed during the First World War, was buried in Westminster Abbey on 11 November 1920. The Cenotaph , located in Whitehall ,

13440-569: Was extracted from mines his companies developed, transported by the Chicago & Illinois Midland Railway to Havana, Illinois to be transferred to barges, both of which his companies controlled, and taken up the Illinois Waterway to Commonwealth Edison power stations. In the late 1920s, he attempted to build a dam on the Cumberland River just above scenic Cumberland Falls, posing a threat to

13560-406: Was followed by the widespread use of low voltage direct current for indoor electric lighting in business and homes after inventor Thomas Edison launched his incandescent bulb based electric " utility " in 1882. Because of the significant advantages of alternating current over direct current in using transformers to raise and lower voltages to allow much longer transmission distances, direct current

13680-518: Was interviewed (rather unsuccessfully) by Frank Norris . At the time of their marriage, Insull was 41 and Gladys was 24. She had been on the stage from childhood. The Insulls lived outside Libertyville, Illinois , in a Mediterranean styled mansion with extensive grounds that later became the Cuneo Museum , in Vernon Hills . They also had an apartment at 1100 North Lake Shore Drive in the city and

13800-408: Was losing money until Insull discovered a way to make it profitable during a Christmas visit to Brighton , England in 1894. To his surprise, he saw that the shops were closed, but every light in them was burning, something that never happened in the US. Finding the head of the town's electric company, he asked him how this could happen and was told the secret to it was not a flat rate bill, but use of

13920-640: Was offered the post of second-vice-president at General Electric, but was unhappy at not being named its president. When the presidency went to another, Insull moved to Chicago as head of the Chicago Edison Company. Another consideration is that he was caught between opposing factions when J. P. Morgan combined the Thomson-Houston Electric Company and Edison General Electric to form the new company in April 1892. Those loyal to Edison accused Insull of selling out, and in fact he did welcome

14040-437: Was once a common sight throughout London and regional cities in the UK. The British Transport Police are responsible for police services on National Rail , London Underground , Docklands Light Railway and Tramlink services. The Ministry of Defence Police is a special police force in London, which does not generally become involved with policing the general public. The UK's domestic counter-intelligence service ( MI5 )

14160-477: Was replaced over the next few decades by alternating current in power delivery. In the mid-1950s, high-voltage direct current transmission was developed, and is now an option instead of long-distance high voltage alternating current systems. For long distance undersea cables (e.g. between countries, such as NorNed ), this DC option is the only technically feasible option. For applications requiring direct current, such as third rail power systems, alternating current

14280-459: Was supervised by polymath Robert Hooke . In 1710, Christopher Wren 's masterpiece, St Paul's Cathedral , was completed, replacing its medieval predecessor that burned in the Great Fire of 1666. The dome of St Paul's dominated the London skyline for centuries, inspiring the artworks and writing of William Blake , with his 1789 poem " Holy Thursday " referring to 'the high dome of Pauls'. During

14400-516: Was unveiled on the same day, and is the focal point for the National Service of Remembrance held annually on Remembrance Sunday , the closest Sunday to 11 November. The 1948 Summer Olympics were held at the original Wembley Stadium , while London was still recovering from the war. From the 1940s, London became home to many immigrants, primarily from Commonwealth countries such as Jamaica, India, Bangladesh and Pakistan, making London one of

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