1. The problem statement, all variables and given/known data 2. Relevant equations P=Vi 3. The attempt at a solution For part a, it looks like the dependent current source (4i1) leads directly to i1, with nothing that could change it. This would mean the interconnection is invalid, right? I can't tell if this circuit is in series or in parallel (is it both?), but I know independent voltage sources can't be parallel, and independent current sources can't be in series. I don't know which one would apply here though. If the circuit is invalid, then I'm not sure how to find the total energy developed, but I guess it would be P=Vi at each node.