In an automobile’s ignition system, an ignition coil, alternatively referred to as a spark coil, functions as an induction coil responsible for converting the low voltage provided by the battery into the thousands of volts necessary to generate an electric spark in the spark plugs. This electric spark is vital for igniting the fuel within the engine. Certain ignition coils are equipped with an internal resistor, while others utilize a resistor wire or an external resistor to regulate the current entering the coil from the 12-volt power supply of the vehicle.
