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Question

# A rheostat is used in an electrical circuitto change the resistance of the circuit.to change the potential difference.to change the emf.to change the current through a particular instrument.

A
to change the potential difference.
B
to change the current through a particular instrument.
C
to change the emf.
D
to change the resistance of the circuit.
Solution
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#### A rheostat is a variable resistor which is used to control current. they are able to vary the resistance in circuit without interruption. the construction of a rheostat is very similar to potentiometer .Thus A rheostat is used in circuit to change the resistance of the circuit. so option correct is A.

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