Hello everyone! I have a general question about how to find out the maximum power transfer to a load resistor with a negative Thevenin Resistance (Rth < 0). I know for positive cases, P = R*(Vth/(R + Rth))^2, in which R is the load resistor connected to the Thevenin equivalence circuit, and Pmax = (Vth)^2/(4*Rth). But what if Rth < 0? I don't think that the Pmax equation still holds true in negative cases for Rth. Can someone help me explain this phenomenon please? I very much appreciate your help! Thank you.