what is emf and how it is calculated

Asked by  | 13th May, 2012, 05:53: PM

Expert Answer:

Flow of current in a wire is produced and maintained only if 
- potential difference is applied across the ends of a wire.
- a constant potential difference is maintained across the two ends of a wire.

The chemical reactions inside the cell generate a difference in potential between the electrodes.

when no current is drawn from the cell ie the cell is not connected in a closed circuit then the potential difference between the electrodes is called emf of the cell.
It is measured by voltmeter.

Answered by  | 13th May, 2012, 07:11: PM

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