spark

A spark is a small, luminous, disruptive electrical discharge of very short duration between two conductors separated by a gas, such as air. This phenomenon is often seen as a hot, glowing particle struck from a larger mass, especially one heated by friction. In electronics, a spark discharge is a disruptive discharge that is accompanied by a spark.12

In gasoline engines, an ignition system uses a spark to ignite the fuel-air mixture, which generates motive force. These systems typically involve a battery, an induction coil, a distributor, and spark plugs to convert low voltage to high voltage, directing it to the spark plugs in the correct firing order. Modern systems often use electronic devices instead of older breaker points for increased reliability and control.3