Question

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

Answer 1

The frequency is adjusted so that maximum current flows in P and Q. that is, frequency is adjusted to have minimum total series impedance. Total series impedance will be minimum when the reactance of L and C cancel each other.

Answer 2

Answer:

A choke coil is preferred over resistances in a.c. circuit because a choke coil has large value of self inductance and hence, the power dissipation is 0 for choke coil. Power factor is 0 for an inductance. ... 1 there will be no effect on the flow of current as resistance is independent of frequency.