1. The problem statement, all variables and given/known data 2. Relevant equations V=IR From my textbook: If the circuit contains both independent and dependent sources, the open‐circuit terminals are shorted and the short‐circuit current between these terminals is determined. The ratio of the open‐circuit voltage to the short‐circuit current is the resistance Rth. 3. The attempt at a solution I determined that Rth and Vo = 0. Now I have to find Rth. But it's not zero? What? The open circuit volage divided by the short circuit current is Rth. But we know for a fact that the open circuit voltage is 0. Rth = 0 / Ix. But this is wrong?