## Electrical Engineering: Principles & Applications (6th Edition)

Here, passive reference configuration is not followed, so power = -vi = -(-15)3$e^{-2t}$ = 45$e^{-2t}$ W, is always positive. This implies energy is delivered to the element. E = $\int P dt$ Energy transferred from t = 0 to t = $\infty$ = $$\int_{0}^{\infty} P dt$$ = $$\int_{0}^{\infty} 45e^{-2t} dt$$ = 22.5 J