This states that any linear bilateral circuit can be replaced by a circuit consisting of a single voltage source in series with a single resistor.

The applet above shows a circuit(black) and its thevenin equivalent(red) If a resistor R is connected to either circuit at the terminals AB then the current through R and the voltage across it is always the same for both circuits. As far as behaviour at the terminals is concerned, the 2 circuits are equivalent.

For nonlinear circuits a linearised equivalent must be obtained about the operating point.

COPYRIGHT © 1996 Cuthbert A. Nyack.