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Aircraft systems and instrumentsQuestion 668 of 934

How is a circuit breaker different from a fuse?

  1. A breaker must be replaced; a fuse can be reset
  2. A breaker can be reset; a fuse must be replaced
  3. A breaker has no amperage limit; a fuse has one
  4. A breaker protects only the battery; a fuse the lights
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Correct answer: A breaker can be reset; a fuse must be replaced

Both protect circuits and equipment from electrical overload.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Electrical System, page 191

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026