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Electric Current and its Effects — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceElectric Current and its Effects1 Mark
MCQ
A rheostat is used in an electrical circuit:
  • ✓
    To change the resistance of the circuit.
  • B
    To change the potential difference.
  • C
    To change the emf.
  • D
    To change the current through a particular instrument.
✓

Answer

Correct option: A.
To change the resistance of the circuit.
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.

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