Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to
all of it here. Please use the Search box or the Site Map
to find what you want - there is a good chance I have it here. Thanks!
Thévénin Equivalent Circuit
The Thévénin Equivalent of a circuit consists of a Thévénin voltage source in series with a Thévénin resistor and is valid for any load. In AC circuits a Thévénin equivalent circuit is valid for a single frequency.
The Thévénin voltage is the open circuit voltage at the output. calculation is straightforward node or loop circuit analysis. Using loop analysis:
Voc: [8 * I1] + [(8+2+6) * I2] - [6 * I3] = 1 A
I2 = ½A ==> Voc = ½A * 6 Ω= 3 V = Vth
Calculate the Thévénin resistance from the open circuit voltage and the short circuit current (set RL = 0 and solve for I3) using Ohm's Law.