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Unformatted text preview: ECE 201 Lecture 13 Thevenin’s and Norton’s Theorems Linear Passive TwoTerminal Networks • A linear twoterminal network is called passive if it consists of resistors, independent sources, but no dependent sources • The vi characteristic of a linear passive twoterminal network has nonnegative slope • (Thevenin Theorem) A linear passive twoterminal network is equivalent to an independent voltage source V in series with a resistance R – Exception: vi characteristic of the passive network has ∞ slope Linear passive twoterminal network Thevenin equivalent circuit Norton Theorem • (Norton Theorem) A linear passive twoterminal network is equivalent to an independent current source I in parallel with a resistance R – Exception: vi characteristic of the passive network has zero slope Linear passive twoterminal network Norton equivalent circuit From Measured Data: Solve Ri+V s =V directly Linear resistive network with dependent sources and Fixed independent sources i s (mA) v (V) 1 6 2 10 Thevenin equivalent circuit Advantage of Having Equivalent Circuits Example from the last lecture Norton equivalent circuit When R changes, one has to solve new nodal (mesh) equations While for equivalent circuit, this is much easier. Why Equivalent Circuits? Linear Network (Resistors, indep....
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 Spring '09
 Bobo
 Thévenin's theorem, Voltage source, Current Source, equivalent circuit, Active Networks, twoterminal network

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