# Definition of Thevenin's theorem

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**Thevenin's theorem**Definition from Encyclopedia Dictionaries & Glossaries

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**Thévenin's theorem**holds, to illustrate in DC circuit theory terms, that (see image):

- Any linear electrical network with voltage and current sources and only resistances can be replaced at terminals A-B by an equivalent voltage source V
_{th}in series connection with an equivalent resistance R_{th}. - This equivalent voltage V
_{th}is the voltage obtained at terminals A-B of the network with terminals A-B open circuited. - This equivalent resistance R
_{th}is the resistance obtained at terminals A-B of the network with all its independent current sources open circuited and all its independent voltage sources short circuited.

- Any linear electrical network with voltage and current sources and only resistances can be replaced at terminals A-B by an equivalent voltage source V

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