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31-05-2021 Instantaneous Power

Q. Instantaneous power is negative, when the polarities of voltage and current are of __________

A. opposite sign
B. same sign
C. voltage is zero
D. current is zero

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Dapzoi Verified
Commented on 2021-05-31 12:38:48 (IST)
Answer: A

Explanation: Instantaneous power is negative, when voltage and current have opposite sign that is if voltage is positive, the current is negative and if current is positive, the voltage is negative.