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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 potentiometer is a variable resistor. A resistor is an electric component that resists the flow of electricity, slowing it down, but not stopping it.Unlike with a normal resistor, the resistance of a potentiometer can be changed, usually either by turning a knob or adjusting a slider. terminal called the base in the potentiometer attaches to a strip of a resistive element, such as graphite. Another terminal called the wiper attaches to a blade that rubs against the resistor. When the slider is moved or the knob is turned, the wiper moves along the resistor strip.