explain the duality between the thevenin's and Norton's equivalent circuit
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The Norton's theorem establishes, dually, that any linear circuit seen from one port may be represented by a current source (with a value equal to the short-circuit current) in parallel with an impedance (with the same value as in the Thévenin's theorem). To this circuit we call the Norton configuration.
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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.
Thevenin and Norton's resistances are equal. Thevenin voltage is equal to Norton's current times Norton resistance. Norton current is equal to Thevenin voltage divided by Thevenin resistance.
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