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Choose correct alternative. A rheostat ...

Choose correct alternative.
A rheostat is used
A. to bring on a known change of resistance in the circuit to alter the current
B. to continuously change the resistance in any arbitrary manner and there by alter the current
C. to make and break the circuit at any instant
D. neither to alter the resistance nor the current

A

A. to bring on a known change of resistance in the circuit to alter the current

B

B. to continuously change the resistance in any arbitrary manner and there by alter the current

C

C. to make and break the circuit at any instant

D

D. neither to alter the resistance nor the current

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