explain the ignition coil as a transformer and current flow

by kermit paul watkins
(west covina)

The ignition coil has a primary winding (fewer windings) surrounding a secondary winding (many more windings). When the primary circuit is turned on current flows and the coil is being saturated. A magnetic field builds. When the primary circuit is opened the magnetic field collapses into the iron core passing through secondary windings. This induces a voltage in the secondary windings which is much higher because of the stepup transformer effect the coil has.

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