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An average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave. If a square wave voltage of peak amplitude of 100 V is measured using this voltmeter, what will be the reading indicated by the meter?

An average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave. If a square wave voltage of peak amplitude of 100 V is measured using this voltmeter, what will be the reading indicated by the meter? Correct Answer 111 V

Concept:

When an average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave, then reading indicated by the meter is given by

Vrms = 1.11 Vavg

Where, Vavg = Average value of given voltage

Calculation:

Given that,

Peak value of square wave voltage, Vm = 100 volt

We know that for square waveform

Vm = Vrms = Vavg

∴ Average value of square wave voltage, Vavg = 100 volts

∴ Reading indicated by the meter can be calculated as

Vrms = 1.11 × 100 = 111 Volts

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