what is a potentiometer ?
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a variable ressisor with a third adjustable terminal is called potentiometer
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A potentiometer is defined as a 3 terminal variable resistor in which the resistance is manually varied to control the flow of electric current. A potentiometer acts as an adjustable voltage divider. It 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 is commonly known in the electric circles.
It is calculated as V / L, where V is the potential difference between two points and L is the distance between two points.
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