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induction coil

noun, Electricity.
a transformer for producing high-voltage alternating current from a low-voltage direct current, consisting essentially of two concentric coils with a common soft-iron core, a primary coil with relatively few windings of heavy wire, and a secondary coil with many turns of fine wire. Excitation of the primary coil by rapidly interrupted or variable current induces high voltage in the secondary coil.
Also called Ruhmkorff coil.
Origin of induction coil
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for induction-coil
Historical Examples
  • A constant discharge of electricity of high tension between the electrodes is effected by means of an induction-coil.

    Edison, His Life and Inventions Frank Lewis Dyer and Thomas Commerford Martin
  • The purpose of the induction-coil is to raise the voltage of the battery.

  • In these ten days the foundation was laid for the induction-coil, modern dynamo-electric machinery, and electric lighting.

    The Story of Great Inventions Elmer Ellsworth Burns
  • In so doing, you have simply had the current from the secondary of an induction-coil.

    ABC of Electricity William Henry Meadowcroft
  • This is one of the principal reasons why induction-coil cores are made up of a bundle of wires instead of a solid piece.

  • When these two wires are wound in coils, together they form an induction-coil.

    The Story of Great Inventions Elmer Ellsworth Burns
  • An Interrupter must be inserted between the battery and one of the wires leading to the primary-coil of the induction-coil.

  • Faraday, as we have seen, discovered the principle of the induction-coil.

    The Story of Great Inventions Elmer Ellsworth Burns
  • With the induction-coil a powerful electric spark can be produced.

    The Story of Great Inventions Elmer Ellsworth Burns
  • The induction-coil may be operated by a storage battery or dynamo.

    The Story of Great Inventions Elmer Ellsworth Burns
British Dictionary definitions for induction-coil

induction coil

a transformer for producing a high voltage from a low voltage. It consists of a cylindrical primary winding of few turns, a concentric secondary winding of many turns, and often a common soft-iron core Sometimes shortened to coil
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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induction-coil in Science
induction coil  
  1. An electrical device consisting of a single coil of conductive material, often surrounding a metallic core, designed to establish a strong magnetic field around the coil. Changes in the current flow through the coil cause fluctuations in the magnetic field that induce a voltage across the coil. Induction coils have many applications, especially in circuits that tune to signals of specific frequencies, as in radios. The ability of an induction coil to induce a voltage is called inductance, and is measured in henrys. Compare capacitor.

  2. A type of transformer that changes a low-voltage direct current to a high-voltage alternating current. Induction coils are used for many purposes, especially as spark coils for firing spark plugs in automobile engines and starting oil burners.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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