B1 is a battery whose emf is to be measured G is the DC1 galvanometer B is the battery which supplies current to the slide wire Let is the (resistance / unit length) of slide wire i is the current through the slide wire when key K is open, when the key k is closed a current will flow through the galvanometer if the volt drop across AC slide wire is not equal to B1. AB is a slide wire of uniform cross section R is a regulating resistance to limit the current (i) through the slide wire. Potentiometers with Direct current: As shown in the fig. Potentiometers Potentiometer is used for the measurement of emfs by comparison with a standard emf.
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