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.

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 tocoil

induction coil

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
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.

First recorded in 1875–80

This is one of the principal reasons why induction-coil cores are made up of a bundle of wires instead of a solid piece.

Surround him with true believers; and it all seems to act like an induction coil.

The commonest instance now of the use of the induction-coil is in the very frequent small machine known as a medical battery.

The current usually used is the Faradic; the induced alternate current from an induction coil.

Unlike the ordinary induction coil, it isn't necessary to keep supplying power to the thing; it's a static condition.

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