What is potentiometer?
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A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.
If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.
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Explanation:
It is a device mainly used to accurately measure the potential difference and e.m.f of a given cell. It is also used to compare e.m.f of two cells or to calculate the internal resistance of a given cell.
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