Meters and troubleshootingQuestion 1191 of 1506

A Hall-effect power meter sees voltage and current 90 degrees apart. What is its net DC output?

  1. Zero
  2. Maximum positive
  3. Maximum negative
  4. Equal to the apparent power
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Correct answer: Zero

The output swings equally positive and negative. This means zero true power.

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

Practice meters and troubleshooting

Questions last reviewed: 18 October 2026