The alternator is powered by what?

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Prepare for the Private Pilot License Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

The alternator is powered by what?

Explanation:
The field windings of the alternator require a direct current to create the magnetic field that allows generation. Supplying DC to the rotor builds the magnetic field, and as the engine turns the rotor, that rotating field induces alternating current in the stator. That AC is then rectified to DC to charge the battery and run the aircraft’s DC electrical system. The excitation current for the field typically comes from the aircraft’s DC source (battery or DC bus) via the regulator. Without this DC excitation, the alternator won’t produce useful output.

The field windings of the alternator require a direct current to create the magnetic field that allows generation. Supplying DC to the rotor builds the magnetic field, and as the engine turns the rotor, that rotating field induces alternating current in the stator. That AC is then rectified to DC to charge the battery and run the aircraft’s DC electrical system. The excitation current for the field typically comes from the aircraft’s DC source (battery or DC bus) via the regulator. Without this DC excitation, the alternator won’t produce useful output.

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