Theory Thevenin and Norton

A. Theory Thevenin
An active circuit, linear and resistive containing one or more sources of voltage or current source can be replaced by a voltage source and a prisoner diseri, consider Figure 4.10.

Figure 4.10 The circuit With Voltage Source Replacement

VT-called replacement Thevenin voltage, RT-called surrogate custody Thevenin. As an example consider the circuit in Figure 4.11 below.

Figure 4.11 replacement circuit Thevenin

To calculate VT RL load is removed, the voltage between a and b without RL is the voltage VT. (Please see Figure 4.12)

Figure 4.12 to get a replacement circuit VT

To calculate the RT to seek custody between a and b (with the voltage source short circuited) It can be clarified by looking at Figure 4.13 below.

Figure 4.13 to get a replacement circuit VT

B. Theory Norton
An active circuit, linear and reisistif containing one or more sources of voltage or current source can be replaced with a current source and a prisoner in parallel with the current source. To calculate the load current source is released and then look for the short circuit current. As for calculating the replacement prisoners do the same with finding a replacement prisoners Thevenin. Between theory Thevenin and Norton has a very close relationship.

If the replacement circuit Thevenin already calculated the replacement circuit Norton easily determined. For example Thevenin above replacement circuit replacing Norton became like Figure 4.14 below.

Figure 4.14 circuit replacement for Norton Theory

Norton flow is obtained by the equation