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Which of the following devices is the more accurate one for the measurement of emf?

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in Physics – Class 12 by (135k points)
Which of the following devices is the more accurate one for the measurement of emf?

(a) Meter Bridge

(b) Voltmeter

(c) Multimeter

(d) Potentiometer

The question was posed to me by my college director while I was bunking the class.

This intriguing question comes from Current Electricity in section Current Electricity of Physics – Class 12

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Best answer
Right choice is (d) Potentiometer

Easy explanation: Potentiometer is the more accurate device to measure emf than the other ones such as multimeter or voltmeter. Potentiometer is highly sensitive and thus, even small emfs can be measured using this device. Moreover, potentiometers do not draw current from the circuit during measurements, like voltmeters.

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