A student learns that an ideal inductor connected to an a.c
PHYSICS · Multi-part · CBSE · Physics · Alternating Current · Alternating Current
Problem
A student learns that an ideal inductor connected to an a.c. source does not consume any electrical power even though an appreciable current flows through it.
(i) Define the term "wattless current" in the context of a.c. circuits.
(ii) Using a phasor diagram for an ideal inductive circuit, explain qualitatively why the average power supplied by the source over one complete cycle is zero.
(iii) A practical choke coil always possesses a small resistance. Explain with reason how this resistance alters the power consumption of the coil when it is connected to the mains.