Use the node voltage method to find how much power the 2 A source extracts from the circuit. Okay, I figure I will find the power dissipated at each resistor, and use that to find how much the 2A source is extracting from the circuit. I redrew the circuit so I could use the supernode a little easier. I chose the bottom node to be my reference node, and the supernode would fall between node's 2&3. HOWEVER, I am very, very weak with this concept of a supernode, so hopefully you can steer me in the right direction. At node one, we have And the supernode equation, I came up with... Now, I have no idea what to write as my third equation. There are no dependent sources to use to create a constraint. Where can I use the 45 V? Should I set my supernode equation equal to it?