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Rotary potentiometers, also known as rotary potentiometers or variable resistors, are variable resistors that allow users to electronically control the resistance of an electrical circuit. They are commonly used for signal conditioning, as well as other such applications. Rheostats, on the other hand, are used for more coarse adjustments of resistance values.

A rotary potentiometer consists of a long, resistive track, such as carbon or metal, which is connected to a shaft that can be turned with a knob. The resistance of the track varies depending on where the knob is turned, which allows users to adjust the resistance values in an electronic circuit. The most common type of rotary potentiometer is the “linear” variety, which will increase the resistance in a linear fashion as the knob is turned.

A rheostat, on the other hand, is a fixed-length, resistive track connected to a movable slider. Turning the slider allows users to adjust the resistance values in an electronic circuit. Unlike a rotary potentiometer, which increases the resistance in a linear fashion, the resistance of a rheostat changes in discrete steps. Rheostats are used for more coarse adjustments of resistance values than rotary potentiometers, and are often used in applications where fine adjustments are not required.

The working principle of rotary potentiometers and rheostats is the same: by varying the resistance of the resistive track, users can adjust the resistance values in an electronic circuit. Both types of devices use electrical contacts to complete a circuit and allow the users to adjust the resistance values. For rotary potentiometers, the contacts are arranged in an arc shape, so turning the knob will cause the contacts to slide along the resistive track and vary the resistance. The knob turns in a linear fashion and increases the resistance in a linear fashion.

For rheostats, the contacts are arranged in a semicircular pattern, so turning the slider will cause the contacts to move along the resistive track and vary the resistance. The slider turns in a discrete fashion and increases the resistance in small, discrete steps.

Rotary potentiometers and rheostats are commonly used in a wide range of applications, from audio and automotive electronics to industrial and medical equipment. They are an inexpensive and easy-to-use way to adjust resistance values in circuits. Rotary potentiometers are ideal for applications where precise adjustments are required, whereas rheostats are best suited for applications where broader adjustments are needed.

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