1. The problem statement, all variables and given/known data http://img69.imageshack.us/img69/1973/captureyxs.png [Broken] Find the Thevenin and Norton equivalent of the circuit above between A and B using the node voltage method. 2. Relevant equations 3. The attempt at a solution I place the ground reference at the node with where the two 10 ohm resistors, 30 volt supply, 40 ohm resistor, and 1 amp source meet in the upper right hand corner. I'm confused by this problem. If I put a wire between A and B to find the short circuit current than the equivalent resistance between the 100 ohm resistor and the wire is zero ohms so I can just ignore this particular resistor. However I don't understand how any current is traveling though this part of the wire since it's just one giant node with one voltage so how can any current travel through it? Thanks for any help.