Physics
A …………… is a device by which resistance in a circuit can be varied continuously.
- key
- switch
- rheostat
- voltmeter
Current Electricity
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Answer
rheostat
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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Related Questions
Identify the correct statement (s)
(i) Primary cell is capable of giving low as well as high current whereas secondary cells provide a weak current only.
(ii) The internal resistance of primary cells is low and that of secondary cells is high.
- (i)
- (ii)
- both (i) and (ii)
- none of the above
A battery is correctly represented by :
Rheostat is used in a circuit to provide :
- fixed current
- fixed voltage
- fixed resistance
- variable resistance
An instrument used to measure the magnitude of current flowing in a circuit is :
- voltmeter
- galvanometer
- ammeter
- rheostat