Red Seal Electrician Practice
AC generationQuestion 901 of 1506

Why is an alternator less likely to spark inside than a DC generator?

  1. It has no brushes or commutator.
  2. It produces lower voltage than any DC generator.
  3. It runs with no rotating part at all.
  4. It uses a transformer in place of a magnet.
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Correct answer: It has no brushes or commutator.

A DC generator needs brushes on a rotating coil, which spark and heat. The alternator avoids this.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 1.1: What is Alternating Current (AC)?

Practice ac generation

Questions last reviewed: 18 October 2026