1. The problem statement, all variables and given/known data http://imageshack.us/a/img809/9307/homeworkprobsg210omgthi.jpg [Broken] Find the Thevenin equivalent circuit with respect to the terminals. 2. Relevant equations V = IR, KVL, KCL voltage division, current division Thevenin formula / procedure 3. The attempt at a solution I think the Thevenin resistance is from A to B so with the 72V source surpressed, then 5 and 20 are in parallel which is 4, and then that would be in series with 8, which is then 12. Then 12 and the original 12 are in parallel, so that would mean R(Th, A to B) = 6Ω But I'm having trouble finding V(Th) from a to B (if that's what I'm supposed to find) I forgot this, but from the diagram, are the 5 ohm and 20 ohm in parallel resistors in parallel with respect to the 72V source? I think the potential from A to B would be the voltage "through" the 8 and 20 ohm resistors, but not sure.