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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.
  The trimmer resistor is a calibration device used to correct (trim) the resistance of some other resistor.   An example might be the feedback loop of an op-amp in com â¦ mon mode. If you wanted a gain of two, you might use a resistor divider with a two to one ratio.