Question:
Which instrument regulates the resistance of current in a circuit?
AVolta cell
BRheostat
CGenerator
DSonometre
Answer:
B. Rheostat
Explanation:
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.