Thévenin's theorem

Theorem in electrical circuit analysis

As originally stated in terms of direct-current resistive circuits only, Thévenin's theorem states that "Any linear electrical network containing only voltage sources, current sources and resistances can be replaced at terminals A–B by an equivalent combination of a voltage source Vth in a series connection with a resistance Rth."The equivalent voltage Vth is the voltage obtained at terminals A–B of the network with terminals A–B open circuited. The equivalent resistance Rth is the resistance that the circuit between terminals A and B would have if all ideal voltage sources in the circuit were replaced by a short circuit and all ideal current sources were replaced by an open circuit. If terminals A and B are connected to one another, the current flowing from A and B will be ⁠⁠ This means that Rth could alternatively be calculated as Vth divided by the short-circuit current between A and B when they are connected together.

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