Figure E.1 illustrates a generalized Ohm's law. A traditional representation of the Ohm's law in the form of a resistor is depicted in Fig. E.1(a). The resistor can be replaced by a voltage-controlled current source (VCCS) controlled by its own voltage and, therefore, its current is , as shown in Fig. E.1(b). The resistor can also be replaced by a current-controlled voltage source (CCVS) controlled by its own current and the voltage across the voltage source is , as depicted in Fig. E.1(c).
Figure E.1 Generalized Ohm's law or resistor absorption theorem.
E.2 Current-Source Absorption Theorem
The source absorption theorems ...
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is depicted in Fig. E.1(a). The resistor 
can be replaced by a voltage-controlled current source (VCCS) controlled by its own voltage 
and, therefore, its current is 
, as shown in Fig. E.1(b). The resistor 
can also be replaced by a current-controlled voltage source (CCVS) controlled by its own current 
and the voltage across the voltage source is 
, as depicted in Fig. E.1(c).