Ronan Asked :
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 
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.
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.