In the ignition coil, what does the coil do to the voltage and amperage?

In an ignition coil, its primary function is to step up the voltage from the battery to a level that is sufficient to create a spark in the spark plug for combustion. The ignition coil consists of a primary winding made of a smaller number of turns of wire and a secondary winding with many more turns of wire. When current flows through the primary winding, it generates a magnetic field. When this current is interrupted, the magnetic field collapses, inducing a much higher voltage in the secondary winding due to the difference in the number of turns of wire.

As a result, the ignition coil not only steps up the voltage to thousands of volts, often between 12,000 to 45,000 volts, but also decreases the current (amperage) as the energy is transformed from the primary circuit to a higher voltage in the secondary circuit. This principle is based on the law of conservation of energy and the transforms within electrical systems. Therefore, the correct understanding is that while the voltage is significantly increased, the current is reduced, leading to the proper functioning of the ignition system in an engine.

The concept of decreasing amperage while stepping up voltage is essential in ensuring that when the spark occurs, it can successfully ignite the air-fuel mixture in the combustion