the purpose of a rheostat is
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Answer: It is used for varying resistance. For this connections are made between terminals C and either of the fixed terminals A & B at the end. It is an adjustable resistor so constructed that its resistance may be changed without opening the circuit in which it is connected, thereby controlling the current in the circuit.
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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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