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Calculate the rms voltage, if the peak value of an a.c. supply is 300 V.

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in Physics – Class 12 by (135k points)
Calculate the rms voltage, if the peak value of an a.c. supply is 300 V.

(a) 561.4 V

(b) 969.2 V

(c) 625.1 V

(d) 212.1 V

I had been asked this question during an interview for a job.

I need to ask this question from AC Voltage Applied to a Resistor topic in chapter Alternating Current of Physics – Class 12

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Right answer is (d) 212.1 V

Explanation: E0 = 300 V

Erms = 0.707 E0

Erms = 0.707 × 300

Erms = 212.1 V

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