Definition - What does Ignition Coil mean?
Ignition Coil is an induction coil present in the ignition system of an automobile that transforms the low voltage of a battery to thousands of volts required to form electric sparks in the spark plugs for igniting the fuel. Some coils contain internal resistor and some rely on an external resistor or resistor wire to limit the current which flows into the coil from a 12-volt supply of a car. Initially, all the ignition coil systems required a capacitor and a mechanical contact breaker point but the present systems work by using a power transistor to offer pulses to the coil.
Petropedia explains Ignition Coil
Ignition Coil plays an important role in the ignition system of an automobile as it offers the high voltage required for sparking the spark plugs. These coils serve the purpose of high voltage transformers. Every coil contains two sets of windings around the segmented or laminated iron core. The coil is basically inserted into a plastic case or metal can with the terminals insulated for low and high voltage connections. If the coil does not function properly, it can damage the spark plugs and ignition wires. These components are required to be checked always while replacing the coil. They can be damaged by the oil that is leaked from other parts onto them. When identified, the leaking parts must be immediately replaced.