Bosch ignition coil

An ignition coil (also called a spark coil) is an induction coil in an automobile's ignition system.

How it worksEdit

This specific form of the autotransformer, together with the contact breaker, converts low voltage from a storage battery's 12 volts into thousands of volts, (high voltage) required by spark plugs in an internal combustion engine.


In modern ignition systems each spark plug has its individual coil, sitting right on top of it, in a so called Direct Ignition (DI) module.

Early historyEdit

The disruptive discharge Tesla coil [1] is an early predecessor of the "ignition coil" in the ignition system. Tesla also gained Template:US patent, "Electrical Igniter for Gas Engines", on August 16, 1898. It used the principles of the ignition coil used today in automobiles. A. Atwater Kent [2], in 1921, patented the modern form of the ignition coil.

Related coilsEdit

  • A Oudin coil [3] is a disruptive discharge coil.


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