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Meter reading is obtained by ________(a) sensing voltage(b) sensing heat power(c) sensing current(d) sensing resistanceI have been asked this question in an international level competition.The question is from True RMS Responding Voltmeter in chapter Electronic Instruments of Electrical Measurements

Answer»

The correct CHOICE is (b) sensing heat power

To explain: In a true R.M.S responding voltmeter, the meter reading is obtained by sensing the heat power of the WAVEFORM. The heat power is DIRECTLY proportional to the r.m.s VALUE of the input.



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