State the advantages of a potentimeter over a voltmeter.

Explanation

Advantages of potentiometer over voltmeter :
(a) Potentiometer measures small terminal Potential difference as wel as e.m.f. of the cell while voltmeter measures only terminal Potential difference of the cell.
(b) By increasing the length of wire accuracy of potentiometer can easily be increased.
(c ) Potentiometer can also measures internal resistance of a cell.