Electrical Circuit Theorems

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Thevenin's Theorem:
(State Thevenin's Theorem and write down the step by step procedure to solving electrical circuit using Thevenin's Theorem.)


Defination:
It provides a mathematical technique for replacing a given network, as viewed from two output terminals, by a single voltage source with a series resistance.It makes the solution of complicated networks (particularly, electronic networks) quite quick and easy.


HOW TO THEVENIZE A GIVEN CIRCUIT ?(Step By Step Procedure For Using Thevenin's Theorem):
 1. Temporarily remove the resistance (called load resistance RL whose current is required.
 2. Find the open-circuit voltage Voc which appears across the two terminals from where resistance has been removed. It is also called Thevenin voltage Vth. 
 3. Compute the resistance of the network as looked into from these two terminals after all voltage sources have been removed leaving behind their internal resistances (if any) and current sources have been replaced by open-circuit i.e. infinite resistance. It is also called Thevenin resistance Rth or Ri.
4. Replace the entire network by a single Thevenin source, whose voltage is Vth or Voc and whose internal resistance is Rth or Ri. 
5. Connect RL back to its terminals from where it was previously removed.
6. Finally, calculate the current flowing through RL by using the equation, 
 I = Vth/(Rth + RL)
or, I = Voc/(Ri + RL)

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