In an ignition system, what voltage is supplied to the coil during starting?

During starting, the ignition system typically receives 12 volts to power the ignition coil. This is the standard voltage that is generated by the vehicle’s battery, which is usually a 12-volt system. The ignition coil uses this voltage to generate a high voltage necessary for creating a spark at the spark plugs, which ignites the air-fuel mixture in the engine cylinders.

In essence, 12 volts is the operational voltage of most automotive electrical systems, providing the reliability and power needed for effective ignition under varying conditions, including cold starts. The other voltage options (6 volts, 24 volts, and 48 volts) do not reflect the standard operating voltage for most automotive ignition systems, making 12 volts the correct and practical choice for starting an engine.