The potentiometer, also known as a rheostat, is a simple electromechanical transducer able to convert rotary or linear motion into a change in resistance. Trimmers perform a very similar function but tend to be used less continuously, through occasional calibration within their circuit.
Potentiometer types and usage possibilities.
The main types on the market are rotary potentiometers, slide-type (linear) or logarithmic: the operation is the same with real differences in precision and physical dimensions.
Potentiometers can also be used as a simple variable resistors.
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