1. The problem statement, all variables and given/known data http://imageshack.us/a/img822/5921/homeworkprobsg22.jpg [Broken] Determine the values of the node voltages Va and Vb 2. Relevant equations Nodal analysis, V = IR maybe KVL and/or KCL 3. The attempt at a solution I got the wrong answer / not sure what the reference node is used for (I know it's the one connecting to ground though, does it have to do with the current?) Vb - Va = 12V Vb = Va + 12V KCL at a: 1.5A + I = Va/6Ω I = -1.5A + Va/6Ω KCL at B: 3.5A + I + Vb/3Ω = 0 Plugging Vb in to KCL at b: 3.5A + I + (Va + 12)/3Ω = 0 Now plugging in KCL at a, and then solving for Va: 3.5A -1.5A + Va/6Ω + (Va + 12V)/3Ω = 0 2A + (Va + 2Va + 24V)/6Ω = 0 2A + (3Va + 24V)/6Ω = 0 (3Va + 24V)/6Ω = -2A 3Va + 24V = -12V 3Va = -30V thus Va = -10V which is supposedly wrong and would make Vb = 2V also wrong Where did I go wrong? Thank you.