Trimmers & Rheostats
Trimmers are potentiometers which need infrequent adjustment and they are often used to calibrate a device or circuit after manufacturing and require a special tool for adjustment. Rheostats are two-terminal variable resistors which function similarly to a potentiometer. A three-terminal potentiometer can be used as a rheostat with the third terminal left unconnected and are typically used as strict variable resistors.
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