# Thevenin's equivalent circuit

When I have to calculate a Thevenin's equivalent circuit which has a current controlled voltage generator, what should I do to calculate the open circuit equivalent voltage to the terminals in question? Is there any difference between a circuit that hasn't any controlled generators? Can you guys give me some examples? Thank you in advance,I know that this could be a stupid question for those who had studied circuits for a long time!

Anyway, here is the circuit i was trying to solve, if you guys want the data just ask • What do you know about Source Transformation? It seems to me that you would need to transform the current source into its equivalent voltage source. Dec 18, 2015 at 22:28
• As i said i already tried to solve that and obviously i transformed the current source into its Thevenin equivalent. I obtained the series connection between E and I*R1, but at the end i found out a negative voltage between A and B terminals. Is that possible or I just miscalculated? Dec 18, 2015 at 22:34
• Apologies, I didn't see anywhere in your description that you already attempted to solve the problem. It helps us give you an answer if you tell us what you have already attempted. . . Dec 18, 2015 at 22:42
• I just applied KVL to the loops i obtained after the semplification you suggested to find the current that flows in the first resistance (and then the voltage of the controlled generator, as Rm is known). After that i obtained that the tension between the terminals in question was equal to the tension of the controlled generator, as apparently in the fourth resistance didn't flow any current. But that tension i found out was negative and this gave me some problems :) Dec 18, 2015 at 22:57