What is potentiometer ?
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Answer....
An instrument for measuring an electromotive force by balancing it against the potential difference produced by passing a known current through a known variable resistance.
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The Potentiometer is an electric instrument that used to measure the EMF (electro motive force) of a given cell, the internal resistance of a cell. And also it is used to compare EMFs of different cells. It can also use as a variable resistor in most of the applications.
Potentiometers can be of two types, linear and rotary. The difference between the two is in the mechanical construction of the potentiometer. A potentiometer consists of four main components: two fixed terminals, one moving terminal (called the wiper), a resistive strip or track, and the housing.
