1. The problem statement, all variables and given/known data I need help with part (b). 2. Relevant equations 3. The attempt at a solution The Thevenin resistance is 15 ohms, voltage open circuit 30 V and the short current circuit is 2 A. You can take these for granted, I've confirmed with a friend. I really don't know what they mean by "voltage-current equation", are they talking about Ohms law?