Biomedical Engineering Reference
In-Depth Information
EXAMPLE PROBLEM 9.10
Find the Th´venin equivalent circuit with respect to terminals A,B for the following circuit.
2
Ω
A
+
−
10 V
2
Ω
4 A
B
Solution
The solution to finding the Th
´
venin equivalent circuit is done in two parts: first finding
V
OC
and then solving for
R
EQ
. The open circuit voltage,
V
OC
, is easily found using the node-voltage
method, as shown in the following circuit.
2
Ω
A
+
+
−
10 V
2
Ω
4 A
V
OC
-
B
The sum of currents leaving the node is
V
OC
10
þ
V
OC
2
4
¼
0
2
and
V
OC
¼
9V
:
R
EQ
is found by first setting all sources dead (the current source is an open circuit and the
voltage source is a short circuit) and then finding the resistance seen from the terminals A,B, as
shown in the following figure.
Next,
Continued
