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What is potentiometer? Discuss its princ...

What is potentiometer? Discuss its principle.

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Potentiometer: it is a device which is used to compare emfs of two cells or to find the internal resistance of a cell. Principle of Potentiometer: When constant current is passed through a wire of uniform area of cross-section, the potential drop across any portion of the wire is directly proportional to the length of that portion. i.e. `V prop l`
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What is potentiometer? With the help of circuit diagram, explain how a potentiometer can be used to compare the emf of two primary cells.