potentiometer principal and working?
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The principle of a potentiometer is that the potential dropped across a segment of a wire of uniform cross-section carrying a constant current is directly proportional to its length. Thepotentiometer is a simple device used to measure the electrical potentials (or compare the e.m.f of a cell).
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potentiometer
it is a device used to measure unknown potential difference.
principal
it is based on the principle that potential drop in a uniform wire is it proportional to the length of the wire.
v = kl
where ,k is the potential gradient
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