A.The coil is actually a transformer (primary winding, secondary winding, iron core, insulating material, etc.).

B.The car's 12V voltage is converted to a voltage of 20,000-30,000V. The car ignition series uses this high voltage to ignite the mixture in the cylinder.

C.The ignition control function of the car is to allocate the ignition high voltage according to the ignition sequence of each cylinder. The function of the ignition coil is to turn the low-pressure DIRECT current into a high voltage, and the high voltage reaches ten thousand volts.