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State Thevenin’s Theorem.

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Any two terminal circuit having number of linear impedances and sources (voltage, current, dependent, independent) can be represented by a simple equivalent circuit consisting of a single voltage source VTh in series with an impedance ZTh, where the source voltage VTh is equal to the open circuit voltage appearing across the two terminals due to internal sources of circuit and the series impedance ZTh is equal to the impedance of the circuit while looking back into the circuit across the two terminals, when the sources are replaced by their internal impedances. 

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