Question

Rheostat is used in a circuit to provide :
(a) fixed current
(b) fixed voltage
(c) fixed resistance
(d) variable resistance

  • Category: Current Electricity Class 9 ICSE
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Answer

(d) variable resistance

Reason — A rheostat is a device by which resistance in a circuit can be varied continuously. It is used to adjust the magnitude of current in a circuit by changing the length of the resistance wire included in the circuit.

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