Car ignition system is designed to give a high voltage pulse to spark plug of IC engine at right time in its rotation cycle. A capacitor is charged by battery and then suddenly discharged into a coil. read more
The heart of this system is a device called an ignition coil. This coil is a kind of transformer. Transformers transfer voltage from one circuit to another, either as a higher voltage (as in a step-up transformer, of which the ignition coil is an example), or a lower voltage (a step-down transformer). read more
Each spark plug in a car has its own ignition coil. The coil is either physically connected to the spark plug with wires or it sits on top of the spark plug without using wires. The spark plug needs about 15,000 to 20,000 volts of electricity in order to form an electric spark that can ignite the fuel. read more