circuits

1. ELECTRONICS
Fall 2020
Lec. 11
Dr. Mona Soliman
Dr.Walid Mohiy
IT Dept.

2. 2
Linear Circuit
 Output is linearly related to input.
 Linear elements
 Independent sources.
 Resistors.
 Linear dependent sources.

3. 3
Linear Circuit
 Eq. circuits and theorems
 Source transformation.
 Superposition.
 Thevenin & Norton.
 Maximum power transfer.

4. Dr. Mohamed Shalaby 4
Superposition
 Principle
 In any linear circuit containing multiple
independent sources,
 the current or voltage at any point in the
network may be calculated as the algebraic
sum of the individual contributions of each
source acting alone.

5. 5
Superposition
 Procedure
 Find the contribution due to only one
independent source by deactivating all
other independent sources.
 Repeat for other sources.
 Sum individual contributions to obtain
desired voltage or current.

6. 6
Voltage source current source

7. 7
Superposition
Vs=10 V, Is=2 mA

8. Method-1
 Using Node analysis
8

9. Method II (using superposition )
9
 For Vs only_
5
o
v V


10.  For Is only
2
o
v V


11. For Vs only
5
o
v V

For Is only
2
o
v V

5 2 7
o
v V
  

12. 12
Find power of 12 Ω Resistor
Superposition
Example -2
Solution

13. 13
 For 100 V only

14. 14
 For 6 A only

15. I=2A
I=5.5A
P=370 W P=48 W
P=370+48=418 W P=(5.5+2)2x12=685 W
Correct

16. 16

17. 17

18. 18

19. 19

20. 20
Superposition
Apply superposition principle to solve for the
terminal voltage

21. 21
Superposition
Vo.c =

22. 22
Superposition
Vo.c =

23. 23
Superposition
Vo.c =

24. 24
Superposition

25. 25
Superposition

26. 26