A potentiometer is basically a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.
The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential (voltage); the component is an implementation of the same principle, hence its name.Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment. Potentiometers operated by a mechanism can be used as position transducers, for example, in a joystick. Potentiometers are rarely used to directly control significant power (more than a watt), since the power dissipated in the potentiometer would be comparable to the power in the controlled load.
Ebot potentiometer consist of 3 pind namely S,V and G(signal, VCC and Ground respectively.)