Definitions for spark coil
Random House Webster's College Dictionary
a coil of insulated wire on an iron core, used for producing a spark in an automotive ignition system.
Category: Electricity and Magnetism, Automotive
Origin of spark coil:
an induction coil used to create sparks
The Standard Electrical Dictionary
A coil for producing a spark from a source of comparatively low electro-motive force. It consists of insulated wire wound round a core of soft iron, best a bundle of short pieces of wire. Such a coil may be eight inches long and three inches thick, and made of No. 18-20 copper wire, with a core one inch in diameter. On connecting a battery therewith and opening or closing the circuit, a spark is produced by self-induction, q. v. It is used for lighting gas.