1. TopiC:- Circuit Theorems
Government engineering college, Palanpur
TopiC:- Circuit Theorems
Prepared by-
Subject – Circuit & Network ( )
Department - Electrical engineering
Faculty name - A.M.Patel sir

2. Subject:- Circuits & Networks Topic:- Circuit Theorems

3. Content Introduction Superposition Source Transformation
Thevenin’s Theorem with examples
Norton’s Theorem with examples

4. Introduction
To develop analysis techniques applicable to linear circuits
To simplify circuit analysis and help handling the complexity

5. Superposition Based on linearity property Statement
The voltage across (current through) an element is the algebraic sum of the voltage across (current through) that element due to each independent source acting alone.

6. Example 1 = +

7. Example 2 = +

8. Example 3

9. Source Transformation

10. Applicable to Dependent Sources

11. Example 1

12. Example 2

13. Thevenin’s Theorem
A variable
element
Thevenin equivalent circuit

14. Continued =
A simple voltage divider

15. Proof of Thevenin’s Theorem+ =
All
indep.
sources on
sources off _

16. Finding VTh and RTh
If no dependent sources included

17. Continued
If dependent sources included, two methods can be applied to determine RTh
External voltage source method
External current source method

18. Example 1 =
RTh
VTh

19. Example 2 =
RTh
voc

20. Norton’s Theorem
Norton equivalent circuit

21. Proof of Norton’s Theorem+ =
All
indep.
sources on
sources off

22. Example = RN IN