Question

What is the uses of driving cell of potentiometer while comparing emf of two cells? Doesnt it affect the reading of galvanometer ?​

Answer 1

Answer:

Potentiometer is a device used to compare the e.m.f. (electromotive force) of two cells, to measure the internal resistance of a cell, and potential difference across a resistor. It consists of a long wire of uniform cross-sectional area and of 10 m in length.