Problem 1-1: Power of Elements

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Find the power of each element. Which one is supplying power and which one is absorbing it?

Power of Elements

Solution

a) Passive sign convention, $P = V \times I = -8 W < 0$ supplying power.

b) Passive sign convention, $P = V \times I = 8 W > 0$ absorbing power.

c) Passive sign convention, $P = V \times I = 20 W > 0$ absorbing power.

d) Active sign convention, $P = - V \times I = - 50 W < 0$ supplying power.

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