CBSE Class 12-science Answered
Why do we prefer a potentiometer to measure the emf of a cell rather than a voltemeter ?
Asked by Topperlearning User | 28 Apr, 2015, 10:41: AM
Expert Answer
A voltmeter draws current from a cell, therefore voltmeter measure terminal potential difference rather than emf, while a potentiometer at balance, does not draw any current from the cell; so the cell remains in open circuit. Hence potentiometer reasds the actual value of emf.
Answered by | 28 Apr, 2015, 12:41: PM
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