Question

what is Potentiometer ? derive it's equation.​

Answer 1

Answer:

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Explanation:

A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. ... Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment.

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Answer 2

$\huge\sf{Answer}$

V = ε – Ir.

So, V = ε – Ir, where V is the potential difference

through the circuit, ε is the emf, I is the

current flowing through the circuit, r is internal

resistance. Usually, the internal resistance of a

cell is not measured because of ε >> Ir.