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ECE 110 M.C. Brunet
Thévenin & Norton Equivalent Circuits
Handout 22
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Thévenin & Norton Equivalent Circuits
Handout 22
Thévenin & Norton Circuits
Are simple forms of linear circuits with
ideal sources
and
resistances.
+
_
V
TH
R
TH
is called a
Thévenin
circuit
called a
orton
ircuit
I
N
R
N
is called a
Norton
circuit
Related important topics
:
characteristics
IV characteristics
Equivalent circuits
Circuits are said to be equivalent if
they have the same IV characteristic.
Note
:
Thévenin & Norton circuits have
linear
IV characteristics….
M.C. BRUNET
ECE 110
UIUC
22.1
ECE 110 M.C. Brunet
Thévenin & Norton Equivalent Circuits
Handout 22
Example 1
:
Give the IV equations for the circuits
I
I
(a)
(b)
2
Ω
V
+
_
5
Ω
V
+
_
I =
I =
(c)
I
10
Ω
V
+
10
Ω
2
Ω
_
I =
Comments?
(d)
I
10
Ω
V
+
_
10
Ω
2
Ω
M.C. BRUNET
ECE 110
UIUC
22.2
I =
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View Full Document ECE 110 M.C. Brunet
Thévenin & Norton Equivalent Circuits
Handout 22
Example 2
:
Give the IV equation and draw the
IV graph for the following circuits
(a)
I
20V
V
+
_
+
_
2Ω
I =
=
=
D
I
x
V
+
For V = 0
I = . . . .
(this is a shortcircuit
connection)
I
For I = 0
V = . . . .
(this is an opencircuit
connection)
V
M.C. BRUNET
ECE 110
UIUC
22.3
Example 2:
(continued)
(b)
I
3Ω
30V
V
+
_
+
_
6Ω
=
=
I
=
=
D
I
=
x
V
+
Comments?
M.C. BRUNET
ECE 110
UIUC
22.4
ECE 110 M.C. Brunet
Thévenin & Norton Equivalent Circuits
Handout 22
A typical question
A linear circuit is given
I
V
+
_
C
I = function (V)
(linear!)
Find the equivalent
Thévenin (or Norton) circuit
I
?
V
+
_
+
_
?
e.g.:
It must have the same
IV as the given circuit.
(
V
TH
= ?,
R
TH
= ?)
M.C. BRUNET
ECE 110
UIUC
22.5
Example 3
: Find the equivalent Thévenin circuit
for the following circuit.
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This note was uploaded on 09/16/2009 for the course ECE 110 taught by Professor Haken during the Spring '08 term at University of Illinois at Urbana–Champaign.
 Spring '08
 HAKEN

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