Electro Magnetic Induction And Alternating Currents Question 171
Question: A small signal voltage $ V(t)=V_{0}\sin \omega t $ is applied across an ideal capacitor C:
Options:
A) Current I (t), lags voltage V (t) by $ 90{}^\circ $ .
B) Over a fall cycle the capacitor C does not consume any energy from the voltage source.
C) Current I (t) is in phase with voltage V (t).
D) Current I (t) leads voltage V (t) by $ 180{}^\circ $ .
Show Answer
Answer:
Correct Answer: B
Solution:
-
As we know, power
$ P=V_{rms}.I_{rms}\cos \phi $
as $ \cos \phi =0 $
$ (\because \phi =90^{o}) $
$ \therefore $ Power consumed =0 (in one complete cycle)
