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Which of the following device is used to measure the e.m.f. of a cell?

Which of the following device is used to measure the e.m.f. of a cell? Correct Answer Potentiometer

CONCEPT:

Some measuring devices are:

 S.No  Voltmeter Ammeter Ohmmeter Potentiometer
1.

It is a device used to measure potential difference and is always put in parallel with the ‘circuit element’ across which potential difference is to be measured.

It is the device to measure current and is always put in connected in series across the device the current is to be measured.

An ohmmeter is an electrical instrument that measures electrical resistance (the opposition offered by a substance to the flow of electric current).

A potentiometer is a device mainly used to measure the emf of a given cell and to compare emf's of cells.
2.

Ideally, the voltmeter has infinite resistance.

 Ideally, the ammeter has zero resistance.  

It is also used to measure the internal resistance of a given cell.


EXPLANATION:

  • From the above, it is clear that a potentiometer is the best device to measure e.m.f. of a cell. Therefore option 4 is correct.

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