A potentiometer is a resistive element with three leading-out terminals and a resistance value that can be adjusted according to a certain variation rule. Potentiometers usually consist of a resistor and a movable brush. When the brush moves along the resistor body, a resistance value or voltage that is related to the displacement amount is obtained at the output terminal. The resolution depends on the theoretical accuracy of the potentiometer. For wire wound potentiometers and linear potentiometers, resolution is expressed as a percentage of the change in resistance caused by each turn of movement of the moving contact on the winding compared to the total resistance. For potentiometers with functional characteristics, resolution is a variable because the resistance of each turn of the winding is different.