Ignition Coil: Description and Operation

PURPOSE
A transformer used to step up low (battery) voltage to high (ignition) voltage capable of firing the spark plugs.

LOCATION
Integral with distributor assembly.

OPERATION
When current flows through the outer, primary winding, a magnetic field is created. When current flow is interrupted, the magnetic field collapses into the iron core through the secondary windings. This sudden change in the magnetic field induces a high voltage in the secondary windings.

CONSTRUCTION
Consists of two windings of wire, primary and secondary, around a laminated iron core. The ratio of the number of wraps in the primary winding to the number of wraps in the secondary winding determines coil peak output voltage.