At t = 0.25 s, the power input is approximately
A) -2.5 W.
B) 2.5 W.
C) -10 W.
D) 10 W.
E) zero.

Name: At t = 0.25 s, the power input is approximately A) -2.5 W. B) 2.5 W. C) -10 W. D) 10 W. E) zero.
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Question

At t = 0.25 s, the power input is approximately
A) -2.5 W. 
B) 2.5 W. 
C) -10 W. 
D) 10 W. 
E) zero.

Quizplus · Accepted Answer

At t=0.25s, the power input is given by the product of the current and the voltage, P=IxV. Reading from the graph, the current is approximately -0.005 A and the voltage is approximately -500 V. Therefore, P = (-0.005 A) x (-500 V) = 2.5 W. So, the answer is B.

At T = 025 S, the Power Input Is Approximately