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Rheostat vs. Dimmer

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Main Difference

The main difference between Rheostat and Dimmer is that the Rheostat is a a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider and Dimmer is a a device used to lower the brightness of a light.

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Wikipedia
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  • Rheostat (noun)

    An electrical resistor, with two terminals, whose resistance is continuously variable by moving a knob or slider.

  • Dimmer (noun)

    A rheostat that is used to vary the intensity of a domestic electric light

  • Dimmer (noun)

    A switch used to select between the low and high headlamp beam on a road vehicle. (usually as "dimmer switch", primarily in North America; elsewhere "dipswitch" or "dipper switch")

Wiktionary
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  • Rheostat (noun)

    an electrical instrument used to control a current by varying the resistance.

  • Dimmer (noun)

    a device for varying the brightness of an electric light.

  • Dimmer (noun)

    a headlight with a low beam.

  • Dimmer (noun)

    small parking lights on a motor vehicle.

Oxford Dictionary
Webster Dictionary
  • Rheostat (noun)

    resistor for regulating current

  • Dimmer (noun)

    a rheostat that varies the current through an electric light in order to control the level of illumination

Princeton's WordNet

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