Electro Magnetic Induction And Alternating Currents Question 99

Question: In an ac circuit with voltage V and current I, the power dissipated is [CBSE PMT 1997]

Options:

A) VI

B) $ \frac{1}{2}VI $

C) $ \frac{1}{\sqrt{2}}VI $

D) Depends on the phase between V and I

Show Answer

Answer:

Correct Answer: D

Solution:

$ \because P=Vi\cos \varphi , $
$ \therefore P\propto \cos \varphi $



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