Explain the concept of rheostat?
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A rheostat is an adjustable resistor used in applications that require the varying of resistance in an electric circuit. Its function is to adjust the magnitude of current in a circuit, by varying the resistance.
The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors. Its resistance element can be a metal wire or ribbon, carbon, or a conducting liquid, depending on the application.
A special type of rheostat is the potentiometer, an instrument that measures an unknown voltage or potential difference by balancing it, wholly or in part, by a known potential difference.
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