ABSTRACT
This chapter is devoted to Thevenin's theorem and the substitution theorem. It explores several general methods of reducing circuit complexity, based on source rearrangement, removal of redundant elements, and exploitation of symmetry. The chapter emphasizes that much time and effort can be saved by first trying to simplify the circuit as much as possible based on applying circuit principles and gaining insight into how the circuit behaves. Graphical analysis applies to both linear and nonlinear circuits and is extensively used with diode and transistor circuits. The zero source resistance behaves as a short circuit, as far as current changes are concerned, and prevents such changes in one circuit from being transmitted to the other circuit. The voltage across the source decreases by an amount equal to the voltage drop across the resistor, but the rest of the circuit is not disturbed.
