Meters and troubleshootingQuestion 1192 of 1506

An energy meter totals power use over time. Which unit is most common?

  1. Watt-hours
  2. Watts
  3. Volt-amperes
  4. Hertz
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Correct answer: Watt-hours

Energy is power x time. Meters usually show watt-hours (or kilowatt-hours).

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.3: Power Measurement

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Questions last reviewed: 18 October 2026