1. The problem statement, all variables and given/known data http://img133.imageshack.us/img133/1101/28162945xv9.jpg [Broken] 2. Relevant equations p = iv i = dq/dt w = intergral of p dt = intergral of vi dt 3. The attempt at a solution I don't really understand how to do this problem. First of all, I know that the area under the graph between some time interval is equal to the charge. So for the part A of the question, I got the following, but I dont even know if its correct. a) @ 1s = 2C, @3s = -1C, @4.5s = 0C I don't know how to do the rest.