The excitation supply for the alternator is most accurately described as coming from which circuit?

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Multiple Choice

The excitation supply for the alternator is most accurately described as coming from which circuit?

Explanation:
The excitation current for an alternator must be a steady direct current to establish the rotor’s magnetic field that the generator uses to induce AC. That field current is supplied from the aircraft’s DC electrical system through the voltage regulator, which modulates how much current is sent to the rotor to maintain proper system voltage. So the best description is a DC circuit—the source of the field current. The rotor drive circuit is mechanical, and while the battery bus can be the source, the essential point is that the excitation itself is supplied as DC through the regulator.

The excitation current for an alternator must be a steady direct current to establish the rotor’s magnetic field that the generator uses to induce AC. That field current is supplied from the aircraft’s DC electrical system through the voltage regulator, which modulates how much current is sent to the rotor to maintain proper system voltage. So the best description is a DC circuit—the source of the field current. The rotor drive circuit is mechanical, and while the battery bus can be the source, the essential point is that the excitation itself is supplied as DC through the regulator.

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