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Resistive Network Ch. 3
Learning objectives of this lecture
z
Analyse circuits using the principle of
superposition
z
Analyse circuits using Thévenin theorem
z
Analyse circuits using Norton theorem
z
Determine average and rms values for time
varying sources
R
v
B
2
+
_
+
_
v
B
1
i
=
R
+_
v
B
1
i
B
1
The net current through
R
is the sum of the in
dividual source currents:
i
=
i
B
1
+
i
B
2
.
R
v
B
2
+
_
i
B
2
+
Principle of Superposition
z
In a
linear
circuit containing N independent
sources, each branch voltage and current is
the sum of N voltages and currents each of
which may be computed by setting all but
one independent source equal to zero and
solving the circuit containing that single
independent source
i
S
R
1
+
_
v
S
A circuit
i
S
R
1
R
2
The same circuit with
v
S
= 0
i
S
R
1
+
_
v
S
R
2
R
2
A circuit
R
1
R
2
The same circuit with
i
S
= 0
+
_
v
S
1. In order to set a voltage source equal to zero, we replace it with a short circuit.
2. In order to set a current source equal to zero, we replace it with an open circuit.
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View Full DocumentExample
Figure 3.25
+
_
Ι
1
Ι
2
Two Terminal Circuit
i
Load
v
+
–
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 Three '09
 ZhengLi

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