A choke is preferred to a resistance for limiting current in AC circuit because

Options

A. choke is cheap
B. there is no wastage of power
C. choke is compact in size
D. choke is a good absorber of heat

Answer

B

Explanation

A choke consists of an inductorm, for an inductor, resistance is negligible and the current lags by `pi//2` with respect to the applied voltage (in a.c.). As the power factor `cos phi` is very small, power consumed is very small. There is less wastage of power.