A current generator

Electricity and Magnetism Level pending

What is the power of the current generator shown on the picture below?

P = − U a b × I s 2 P = -Uab\times Is^2 P = − U a b × I s P = -Uab\times Is P = U a b 2 × I s P = Uab^2\times Is P = U a b × I s P = Uab\times Is

Djordje Veljkovic by Djordje Veljkovic , 19, Serbia

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1 solution

Djordje Veljkovic
May 12, 2017

The current naturally flows from a point on a lower potential to a point on a higher potential. The arrow inside of the current generator shows the direction in which the current flows, meaning that P = U b a ∗ I s P = Uba * Is . We know that U b a = V b − V a Uba = Vb - Va , and that U a b = V a − V b Uab = Va - Vb . From these two expressions, we can conclude that U b a = − U a b Uba = -Uab , therefore the power of this current generator is P = − U a b ∗ I s P = -Uab * Is .

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