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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.
There are two types of variable resistor: 1  Variable resistors, which are altered continually as they work: eg for volume control in a radio. 2  Pre-set potentiometers, which have a resistance control that is adjusted and then fixed. These resistors would normally be adjusted once only.