Alternating Current - Result Question 8
8. In an A.C. circuit with voltage $V$ and current $I$ the power dissipated is
[1997]
(a) dependent on the phase between V and I
(b) $\frac{1}{\sqrt{2}} VI$
(c) $\frac{1}{2} VI$
(d) VI
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Answer:
Correct Answer: 8. (a)
Solution:
- (a) Power dissipated $=E _{\text{rms }} \cdot I _{\text{rms }}$
$=(E _{rms})(I _{rms}) \cos \theta$
Hence, power dissipated depends upon phase difference.
