1. The problem statement, all variables and given/known data Determine the Thevenin equivalent with respect to the terminals a,b. 2. Relevant equations Rth=Voc/Isc 3. The attempt at a solution Right now I'm just trying to calculate Rth by removing the sources from the circuit. When I calculated the Rth using the node voltage/mesh current method I calculated it to be 20 kΩ. So right now my idea is I have to short out the voltage source and open the current source. I think(?) this means the 2kΩ, 20kΩ, and 5kΩ(maybe not) would be cancelled out and the rest of the circuit would be intact. So I calculated Rth based on the rest... (40kΩ+10kΩ)||50kΩ=25kΩ Can someone explain what I did wrong? I also tried doing (10kΩ+50kΩ)||20kΩ+5kΩ which gave me an answer of 20kΩ but I do not think I can add the 5kΩ resistor to the 20kΩ resistor in that order.