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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.
A rheostat is an adjustable resistor that is used to control the electrical resistance of a circuit without interrupting the flow of electrical current to that circuit. Rheostats are used for appliances and other items that need both high voltage and electrical current that can be interrupted. GSK Â· 6 years ago.