


Thévenin's Theorem
Any voltage network which may be viewed from two terminals can be replaced by a voltagesource equivalent circuit comprising a single voltage source E and a single series resistance R.. The voltage V is the opencircuit voltage between the two terminals and the resistance Z is the resistance of the network viewed from the terminals with all voltage sources removed from circuit.
Sample
All circuits are equivalent. Resistors R1,R2, R3 and voltage source are transformed into Requ Eequ,
see parallel, series simplifications.
To determine Eequ we shall break off branch connecting node 1 and node 2
Norton's Theorem
Any current network which may be viewed from two terminals can be replaced by a currentsource equivalent circuit comprising a single current source I and a single shunt conductance G. The current I is the shortcircuit current between the two terminals and the conductance G is the conductance of the network viewed from the terminals with all branches containing current sources are broken off.
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