Question

For measuring voltage of any circuit, potentiometer is preferred to voltmeter because

• A. the potentiometer is cheap and easy to handle.
• B. calibration in the voltmeter is sometimes wrong.
• C. the potential draws no current during measurement.
• D. range of the voltmeter is not as wide as that of the potentiometer.

Answer 1

The correct option is C the potential draws no current during measurement.

The potentiometer is preferred over voltmeter for measurement of emf of cell because the potentiometer does not draw any current for itself from the primary circuit. Therefore it gives more accurate measurement thereby acting as an ideal voltmeter.