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Standard X
Physics
Circuit diagram & commonly used symbols
Question

A rheostat is used in an electrical circuit
  1. to change the resistance of the circuit.
  2. to change the potential difference.
  3. to change the emf.
  4. to change the current through a particular instrument.

A
to change the potential difference.
B
to change the resistance of the circuit.
C
to change the current through a particular instrument.
D
to change the emf.
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Solution
Verified by Toppr

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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