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variable resistor. A rheostat. variable resistor - Computer Definition. An electronic component that is used to vary the amount of current that flows through a circuit. It works by sliding a wiper terminal across a resistive material, typically a thin film or chunk of carbon or a resistive wire made of nickel chromium or tungsten alloys.
- notes or overview about the adjustable resistor or variable resistor used as a trimmer resistor and the circuit symbol. Variable or adjustable resistors are often needed within electronic circuits to act as a preset control within the circuit. The variable resistor, is also widely referred to as a potentiometer as a result of its configuration.