Which component converts AC power from the alternator to DC power?

The diode rectifier is the component that converts AC power from the alternator to DC power. In automotive applications, alternators generate alternating current (AC) during operation. However, the electrical systems in vehicles, including the battery and various electronic modules, require direct current (DC) to function properly.

The diode rectifier consists of diodes that allow current to flow in one direction only. When AC power flows through the rectifier, the diodes effectively "chop off" half of the wave, resulting in a unidirectional flow of current, which is converted into DC.

This conversion is critical for the proper functioning of the vehicle's electrical system, as many components are designed to operate on DC voltage. The diode rectifier ensures that the power generated by the alternator can be utilized effectively by the vehicle, keeping the battery charged and powering other electrical systems.

The battery stores electrical energy but does not convert AC to DC. An inverter is used in different contexts, typically to convert DC to AC, which is not relevant here. A voltage regulator controls the voltage output from the alternator but does not perform the conversion from AC to DC.