1. The problem statement, all variables and given/known data Find the thevenin equivalent of the cicuit shown below with V=500 V and i=10 A 2. Relevant equations Voc=Vth Isc=VN 3. The attempt at a solution So, to solve this, I used my instructors method of first finding the Rth. So, what I did was set the independent sources to 0(based on the fact that Rsource doesn't change based on Vth), and tried to solve for the resistance. I used the y-Δ transformation on the three at the bottom and got my Rsource. However, I am confused as to if this is right or if I am allowed to do that. I got Rsource to be 74.2 ohms, and that doesn't look correct, so I cant really move from there.