Which of the following devices should be used for accurate measurement of low D.C. voltage ?
Correct answer: B. D.C. potentiometer
- A. Small range moving coil voltmeter
- B. D.C. potentiometer
- C. Small range thermocouple voltmeter
- D. None of the above
Explanation
A DC potentiometer is a null-type instrument, so it draws no current from the source at balance and avoids loading errors. This makes it more accurate for measuring small DC voltages than an ordinary moving-coil or thermocouple voltmeter.
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