Question

Derive the expression for the average Power dissipated in a series LCR circuit for an ac source of a voltage, v = v_m sin ωt, carrying a current , i = 

Hence define the term "Wattless current". State under what condition it can be realized in a circuit.

Answer 1

Wattless current is that which flows in the circuit but no power dissipation occurs.

It is realized only when circuit is purely inductive or capacitive,