Which component is used to convert AC to DC power in aircraft?

The component used to convert alternating current (AC) to direct current (DC) power in aircraft is the rectifier. A rectifier functions by allowing current to flow only in one direction, effectively converting the AC waveform—which alternates in polarity—into a DC waveform, which flows in a single direction. This is crucial in aircraft electrical systems because many of the essential instruments and devices operate on DC power.

In aircraft, rectifiers can take different forms, such as half-wave or full-wave rectifiers, depending on the specifics of the power conversion needs. They are often used in conjunction with transformers and other components to ensure that the electrical system meets the required specifications for reliability and efficiency.

The other choices do not perform the function of converting AC to DC. An oscillator is responsible for generating a specific frequency AC signal, a generator produces AC or DC power depending on its design but is not specifically tasked with conversion, and a transformer is used to change the voltage level of AC power, but it does not convert AC to DC.