Electrical Engineering · Electrical Measurements
Why does a standard permanent magnet moving coil (PMMC) AC rectifier voltmeter respond to average value rather than true RMS value of a rectified sine wave?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Because internal rectifiers amplify signal magnitude
- 2Because the moving-coil instrument mechanism inherently responds to average torque✓
- 3Because it active-filters high frequency components
- 4Because it directly measures peak-to-peak voltage
Correct answer
Because the moving-coil instrument mechanism inherently responds to average torque
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