Physics-Power in AC Circuits
NEET Physics Power in AC Circuits MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Which of the following statements about power in AC circuits is correct?
A
The average power consumed in an AC circuit is given by P = VI cosφ, where φ is the phase difference.
B
RMS values for AC quantities are not necessary to calculate average power.
C
The instantaneous power in an AC circuit is always positive.
D
The relation between AC voltage and current is different from that in DC circuits.
Correct Answer
Option A
Detailed Explanation
The correct statement is that average power in AC circuits is indeed given by P = VI cosφ, where φ is the phase difference between voltage and current. This derives from the average power formula provided in the NCERT content.
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