A choke coil is preferred to a resistance for reducing current in an ac circuit because .

Options

A. choke coil 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

In an AC circuit , the coil of high inductance and negligible resistance used to control current, is called the choke coil . The power factor of such a coil is given by
cos `phi` = R/`sqrt R^(2) + omega^(2)L^(2) ` `approx` R `omega`L (as R ltlt `omega`L)