Question

A choke coil is preferred to a rheostat in ac circuit as(a) It consumes almost zero power(b) It increases current
(c) It increases power(d) It increases voltage

Answer 1

answer : option (a) it consumes almost zero power.

explanation : firstly, you should know about choke coil. choke coil is an inductor which is used to block high frequency alternating current in an electrical circuit.

Choke coil is preferred over resistance in ac circuit this is because, large value of self inductance of choke coil. and hence, the power dissipation for a choke coil is 0.

That's why, A choke coil is preferred to a rheostat in ac circuit as it consumes almost zero power.