measurements of emf of commercial cell like mobile, watch, pencil cell of different brands, (minimum5) using digital potentiometer. comparison of emf value with value determined using voltmeter
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Potentiometers
Explanation:
Potentiometers are the instruments that calculate the potential difference without using a lot of electricity.
If there is no electrical current running through it, the electric force (emf) of a cell is its terminal voltage.
A potential difference between the electrode is the terminal voltage of the cell. The emf of a cell can not be determined by a voltmeter since a voltmeter draws some cell current.
A potentiometer is used to calculate the emff of a cell as no current flows in a potentiometer calculation.
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