1. The problem statement, all variables and given/known data [PLAIN]http://img535.imageshack.us/img535/7201/electriccircuits113.png [Broken] 2. Relevant equations p = dW/dt; p = vi; W = Integral (p(t)) dt 3. The attempt at a solution I think for the most part I got parts a and b correct. What I'm having significant trouble with is part c. The answer in the back of the book is 42.678 W. I believe I have to find power first, then find the energy from integrating that power and lastly take the derivative with respect to time in order to find the instantaneous power. The only thing is, what values of t are even present to plug in at the end to find the answer to part c? I'm getting confused on this one, badly.