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Uh, I'm trying to undestand how to prove Thevenin's theorem. The Sadiku book puts an independent current source where the load used to be in order to reach the equation: V = Vth + I*Rth. I do understand how he reaches that conclusion after putting the source, what I don't understand is why he can put that current source where the load was. Could someone explain to me that? I'm not sure if that is a formal proof, but it is a correct way of proving it, then I wish to learn it.

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# Need help understanding the proof of Thevenin's theorem

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