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**1. Homework Statement**

Find the Thev Eq circuit for a DC power supply that has a 30-volt terminal voltage when delivering 400mA and a 27-volt terminal voltage when delivering 600mA.

**2. Homework Equations**

KVL: V

_{s}=I

_{s}R1+I

_{s}R2

V

_{th}=I

_{sc}*R

_{th}

**3. The Attempt at a Solution**

Assuming that each 3volt step is a 200mA change, than Voc would be 36v. I determined the load resistance by checking both current EQs [6v

_{load}/.4A] and [9v

_{load}/.6A] and determined the solution of both to be 15ohms. I did a KVL utilizing the 30v and 400mA figures and determined that R

_{th}is 75ohms. I then did a KVL with the other figures and received a 30ohm answer. Where have I strayed???