Adjust the power generation of the car generator, when the speed is low, the adjusted current is large, when the speed is high, the adjusted current is small, so that the generator can stabilize the output, and the electrical equipment in the car will not be damaged due to excessive voltage.

Bridge rectifiers as a type of full-wave rectifier that uses four or more diodes in a bridge circuit configuration to efficiently convert alternating (AC) current to a direct (DC) current.

A carbon brush is a component used to conduct electrical current between the stationary and rotating parts of a motor. In a generator or motor, the commutator rotates on a shaft and the fixed carbon brush rides on it to permit the flow of electricity and complete a circuit.

An alternator is a type of electric generator used in modern automobiles to charge the battery and to power the electrical system when its engine is running.