Question

Define potentiometer ​

Answer 1

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Potentiometer is a mainly used to measure emf of a given cell, internal resistance of a cell and also to compare emf's of cells.

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Answer 2

A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.[1] If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat. hope it helps you........... .