Device used to regulate the current in an electric circuit is

Options

A. transformer
B. voltmeter
C. rheostat
D. galvanometer

Answer

C

Explanation

Transformer is used to increase (step-up) or decrease (step-down) the voltage without changing power and frequency.
Voltmeter is used to measure potential difference between two points in an electrical circuit.
Rheostat is use to control the current by changing the value of resistance.
Hence, it is used to regulate the current in an electric circuit. Galvanometer is used to measure electric current in an electric circuit.