Potentiometers and variable resistors are both adjustable resistors used to measure or divide voltage to protect or control circuits. Potentiometers are a commonly used variable resistor, which is a rotary adjustable fixed resistor. It is connected to a certain point in the circuit, and when the potentiometer adjusts the position of the sliding rod, the voltage signal at the output end can be changed. Variable resistors, also known as electronic resistors, are a type of tunable fixed resistor in the circuit.

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