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EE 1270: Introduction to Electric Circuits
Lecture 12:
Superposition
Chapter 4
Techniques of Circuit Analysis:
Sections 4.13
EE 1270 Introduction to Electric Circuits
Suketu Naik
1
Superposition
Purpose
Simply complex circuit with many independent sources.
 If a circuit has two or more independent sources, one
way to determine the contribution of each independent
source to the variable and then add them up.
Steps:
1) Turn off (replace voltage source with short and current source with
open) all independent sources except one source. Find the output
(voltage or current) due to that active source.
2) Repeat step 1 for each of the other independent sources.
3) Find the total contribution by adding algebraically all the
contributions due to the independent sources.
EE 1270 Introduction to Electric Circuits
Suketu Naik
Fig. 4.8 (p.132 Sadiku 4th edition)
2
Find vo using superposition
EE 1270 Introduction to Electric Circuits
Suketu Naik
Fig. 4.62
3
a) Find the branch currents using superposition
EE 1270 Introduction to Electric Circuits
Suketu Naik
Example 4.4 (p.132 Sadiku 4th edition)
4
Find io using superposition
EE 1270 Introduction to Electric Circuits
Suketu Naik
P4.98
5
Find i using superposition
EE 1270 Introduction to Electric Circuits
Suketu Naik