Question

which is better for comparing the e.m.fs.of two primary cells a voltmeter or a potentiometer and why?
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Answer 1

Answer:

voltmeter

Explanation:

potentiometer is an instrument for measuring an electromotive force by balancing it against the potential difference produced by passing a known current through a known variable resistane.

to calculate e.m.f.s of 2 primary cells, we use voltmeter.and for1 cell ,we use ammeter.

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