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Thevenin's and Norton's Theorem

Theveninís theorem simplifies calculations and explanations of complex circuit operations.

Nortonís theorem also simplifies complex circuits.

Relationship between Thevenin and Norton Circuits

Norton's theorem can be derived from the duality principle. It states that for any theorem in electrical circuit analysis there is a dual (opposite) theorem in which one replaces the original quantities with dual quantities. The figure below summarizes the duality principle as it applies to Thevenin and Norton circuits. It means that we can use either circuit in our calculations. Both equivalent circuits are useful and sometimes it is easier to use Thevenin, at other times we use Norton. It depends on the specific problem.

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