The main component of conventional ignition system (battery, ignition switch, ignition coil, resistor; distributor; distributor cap, rotor/distributor rotor, ignition cable/ignition wire/ignition lead, spark plug).

The ignition coil

The primary circuit (winding) carries low voltage. This circuit operates only on battery current and is controlled by the breaker points and the ignition switch. The secondary circuit consists of the secondary windings in the coil; The high tension lead between the distributor and coil wire.

Spark plug

Spark plugs emit an electrical spark across a small gap to ignite the mixture of air and fuel.