Potentiometers can be categorized according to their resistance value linear change patterns into exponential potentiometers, logarithmic potentiometers, and linear potentiometers. The term "linear resistance" of a potentiometer refers to the relationship between the potentiometer's rotation angle (or travel)

The relationship between the output voltage when used as a voltage divider and the resistance value of the potentiometer as it varies with the rotation angle of the sliding contact point, which can theoretically take any functional form.

The resistance variation characteristic of a potentiometer refers to the relationship between the potentiometer's resistance and the length of movement of the sliding contact or the angle of rotation of the shaft, which is the resistance output function characteristic.

There are commonly 3 types available.

1) Characteristics of Exponential Potentiometer Resistance Variation

The resistance change of an exponential potentiometer is exponentially related to the movement of the sliding contact. Due to the uneven distribution of conductive material on the resistor body, the resistance change is slower at the beginning of rotation. As the rotation angle reaches the midpoint of the travel, the resistance change becomes faster. Exponential potentiometers are suitable for volume control circuits, as the human ear is sensitive to changes in sound volume. After the volume reaches a certain level, the ear's perception becomes less acute. Therefore, exponential potentiometers are generally used for volume control to ensure a smooth and comfortable change in sound.

2) Characteristics of logarithmic potentiometer resistance changes

The resistance value change of a logarithmic potentiometer is logarithmically related to the movement of the wiper. Due to the uneven distribution of conductive material on the resistor, the resistance changes rapidly at the beginning of rotation, and slows down as the rotation angle reaches the latter half of the stroke. Logarithmic potentiometers are suitable for electronic circuits that require the opposite of an exponential potentiometer, such as the contrast control circuit in televisions and tone control circuits.

3) Characteristics of Linear Potentiometer Resistance Change

The resistance change of a linear potentiometer is linearly related to the movement of the wiper. The conductive material distribution on the resistor of a linear potentiometer is uniform, with the resistance per unit length being approximately equal. It is suitable for applications requiring uniform adjustment, such as voltage dividers.