Question

Which instrument regulates the resistance of current in a circuit?

• A. Volta cell
• B. Rheostat
• C. Generator
• D. Sonometre

Answer 1

Answer:

B. Rheostat

• The potentiometer is an instrument used for measuring the unknown voltage by comparing it with the known voltage.

• It can be used to determine the emf and internal resistance of the given cell and also used to compare the emf of different cells.

• The comparative method is used by the potentiometer.