Question

Explain the principle of a potentiometer. Describe how will you determine (a) the ratio of emfs of two primary cells using potentiometer. (b) The internal resistance of a primary cell using potentiometer. (c) potential difference of cell using potentiometer

Answer 1

Potentiometer. Potentiometer is a device used to compare the e.m.f. ... The potentiometer works on theprinciple that when a constant current flows through a wire of uniform cross sectional area, potential difference between its two points is directly proportional to the length of the wire between the two points.

Answer 2

The potentiometer is based on the fact that the fall of potential across any position of the wire is of uniform area of cross section and a constant current is flowing through it

Subdivision (c)-- don't know