induc'tion coil"

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

inductioninduction furnace
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