Question

In Question 3 and 4, what is the net power absorbed by each circuit over a complete cycle ? Explain your answer.

Answer 1

`P = E_(v) I_(v) cos phi`
In a pure inductor, phase difference between alternating voltage and current is `phi = 90^(@)`
`:. P = E_(v) I_(v) cos 90^(@) =` Zero.
In Q.4 `P = E_(v) I_(v) cos phi`
In a pure capacitor, phase difference between alternating voltage and current is `phi = 90^(@)`
`:. P = E_(v) I_(v) cos 90^(@) =` Zero
Infact, in both the cases, power spent in one half cycle is retrieved in hte other half cycle.