1. The problem statement, all variables and given/known data [PLAIN]http://img143.imageshack.us/img143/3746/electriccircuits.png [Broken] 2. Relevant equations 3. The attempt at a solution Can someone help me with part B of this? I understand that in part a it says the 5 A source is delivering 10 W of power, so that would in turn make the positive terminal of the source at the top, since its delivering power. X1 is absorbing power which would mean it takes in through the positive terminal and leaves through the negative. For part b I get that the 2 V is constant throughout the circuit since its closed so the Power at the 3 A source is 6 W. But I'm having a hard time understanding why the Power at the element X1 is 4 W according to the books answer. My main concern is following the current flow here, I mean isn't the 2 Volts going through the element X1? I'm just having a hard time understanding the diagram.