10 V
100
Ω
100 mA
V
Y
+
_
+
_
V
X
100
Ω
100
Ω
Lesson 10 – Superposition and Thèvenin/Norton Theorems (Sections 33 and 34) (CLOs 32 and 33)
Superposition
i
s more of a learning technique than a useful tool since most simulation tools can solve
multiple source problems with no extra effort.
However, there are applications where one needs to find the
contribution of a particular source, for example.
Furthermore, superposition is a direct consequence of
linearity and is thusly useful in demonstrating the benefit of linearity .Thévenin and Norton Equivalent
circuits are very important to understanding concepts from loading to interfacing.
They can also be used for
contractual representations wherein other circuits must interface with the equivalent circuit.
Superposition
Start by explaining the principle.
Then explain how to proceed. Keep one source ON and set all the others to
zero. Solve for the desired output due the one that is ON.
Record this value.
Set it to zero and turn the next
source ON.
Repeat. And so on.
Then the logical question arises “How do we set sources to zero?”
Recall the
iv
characteristics of a resistor
and the
iv
of the resistance extremes – a short and an open.
They are identical to the
iv
characteristics of a
voltage source set to zero or a current source set to zero. Hence, set voltage sources to zero by replacing them
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 Spring '08
 MAURICIODEOLIVERIA
 Voltage divider, Thévenin's theorem, Norton equivalent circuits

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