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Good evening sir. Please explain my doubt clarity. Please explain internal resistance of cell by using potentiometer principle.

Good evening sir.
Please explain my doubt clarity.
Please explain internal resistance of cell by using potentiometer principle.

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1 Answers

Arun
25763 Points
2 years ago

Potentiometer is a device used to measure the internal resistance of a cell, to compare the e.m.f. of two cells and potential difference across a resistor. It consists of a long wire of uniform cross sectional area and of 10 m in length. The material of wire should have a high resistivity and low temperature coefficient.  The wires are stretched parallel to each other on a wooden board. The wires are joined in series by using thick copper strips. A metre scale is also attached on the wooden board.

It works on the principle 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. 

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