what is rheostat? why it is used?
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Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.
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rheostat is a two terminal device unlike potentiometer which is three terminal device... it is used for varying the resistance and control the current...
as you know that
R=V/I ( by ohms law)
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