Potentiometer in the circuit the main role has the following three aspects

1. Used as voltage divider

Potentiometer It is a continuously adjustable resistor, when adjusting the potentiometer's turn or slide handle, the moving contact slides on the resistor body. At this time, the output voltage can be obtained at the output end of the potentiometer, which is related to the applied voltage of the potentiometer and the Angle or stroke of the movable arm.

2. Used as a rheostat

When the potentiometer is used as a rheostat, it should be connected into two ends of the device, so that within the range of the potentiometer, a smooth and continuously changing resistance value can be obtained.

3. Used as a current controller

When a potentiometer is used as a current controller, one of the selected current outputs must be the slide contact outlet.