This article is about the type of transformer that produces high-voltage pulses. For the more general electrical component, see Inductor. For the high-frequency heating coil, see induction heating. For the device in telephone sets, see hybrid coil.
Antique induction coil used in schools, from around 1900, Bremerhaven, GermanyInduction coil showing construction, from 1920.
An induction coil or "spark coil" (archaically known as an inductorium or Ruhmkorff coil[1] after Heinrich Rühmkorff) is a type of electrical transformer[2][3][4] used to produce high-voltage pulses from a low-voltage direct current (DC) supply.[1][5] To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called an interrupter.[1] Invented in 1836 by the Irish-Catholic priest Nicholas Callan, with additional research by Charles Grafton Page and others,[1] the induction coil was the first type of transformer. It was widely used in x-ray machines,[1][6] spark-gap radio transmitters,[1][6] arc lighting and quack medical electrotherapy devices from the 1880s to the 1920s. Today its only common use is as the ignition coils in internal combustion engines and in physics education to demonstrate induction.
^ abcdefFleming, John Ambrose (1911). "Induction Coil" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 14 (11th ed.). Cambridge University Press. pp. 502–505.
^"Annus Mirabilis". The New Scientist. 5 (19). London: Reed Business Information: 445. February 1959. Retrieved 20 November 2018.
^Strickland, Jeffrey (2011). Weird Scientists: the Creators of Quantum Physics. Lulu. p. 98. ISBN 978-1-257-97624-9.
^Waygood, Adrian (2016). Electrical Science for Technicians. Routledge. p. 162. ISBN 978-1-317-53491-4.
^Collins, Archie F. (1908). The Design and Construction of Induction Coils. New York: Munn & Co. p. 98. p.98
An inductioncoil or "spark coil" (archaically known as an inductorium or Ruhmkorff coil after Heinrich Rühmkorff) is a type of electrical transformer...
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in County Kildare from 1834, and is best known for his work on the inductioncoil. He was born and raised in Dundalk, County Louth, where he attended...
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needed] rather than using the induction charging of an ignition coil. Typical output voltages for modern ignition coils vary from 15 kV (for a lawnmower...
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titled The American Claim to the InductionCoil and its electrostatic Developments. By the 1860s, the inductioncoil was becoming a prominent instrument...
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manifestations of electromagnetic induction. For example, he saw transient currents when he quickly slid a bar magnet in and out of a coil of wires, and he generated...
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hydrofluoric acid is being used. The end of this torch is placed inside an inductioncoil supplied with a radio-frequency electric current. A flow of argon gas...
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