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Aircraft systems and instrumentsQuestion 669 of 934

The ammeter pointer shows a minus indication. What does this mean?

  1. The battery is charging at a high rate of current
  2. The voltage regulator output is set too high
  3. The battery supplies more current than it receives
  4. The alternator is producing more than the load needs
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Correct answer: The battery supplies more current than it receives

A plus indication shows the charging rate of the battery.

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