Question

Explain how the internal resistance of a primary cells determined using potentiometer

Answer 1

Answer:

Potentiometer. 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 wires are joined in series by using thick copper strips.

Explanation:

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Answer 2

Answer:

1. Internal resistance refers to the opposition to the flow of current offered by the cells and batteries themselves resulting in the generation of heat.
2. It is measured in ohms.
3. e = I (r + R)
4. Potentiometer is used to measure the internal resistance of a cell
5. It is used to compare the e.m.f. of two cells and potential difference across a resistor.
6. 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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