AC generationQuestion 514 of 1506

What is the easiest way to adjust the voltage of an alternator?

  1. Vary the number of brushes
  2. Change the wire colour code
  3. Vary the field strength
  4. Change the prime mover type
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Correct answer: Vary the field strength

Changing speed would also change the frequency.

Source: Trigonometry and Single Phase AC Generation for Electricians (Flinn), 3.2: The Alternator

Practice ac generation

Questions last reviewed: 18 October 2026