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Q: ––––––––– is a device used for varying the resistance of an electrical circuit.
  • A. Voltmeter
  • B. Galvanometer
  • C. Ammeter
  • D. Rheostat
Correct Answer: Option D - A Rheostat is variable resistor that is used for controlling the electric current flow. They are able to vary the resistance of a circuit without interruption.
D. A Rheostat is variable resistor that is used for controlling the electric current flow. They are able to vary the resistance of a circuit without interruption.

Explanations:

A Rheostat is variable resistor that is used for controlling the electric current flow. They are able to vary the resistance of a circuit without interruption.