Biomedical Engineering Reference
In-Depth Information
2
Ω
A
2 Ω
B
R EQ
From the previous circuit, it is clear that R EQ is equal to 1
O
(that is, 2
O k
2
O
). Thus, the
Th ´ venin equivalent circuit is
1 Ω
A
+
9 V
B
R EQ as
not all voltages and currents are relevant in the other circuit and one cannot simply mix and
match.
It is important to note that the circuit used in finding
V OC is not to be used in finding
If the terminals A,B are shorted as shown in Figure 9.24, the current that flows is denoted
I SC
, and the following relationship holds:
R EQ ¼ V OC
I SC
ð
9
:
18
Þ
9.8 INDUCTORS
In the previous sections of this chapter, we considered circuits involving sources and
resistors that are described with algebraic equations. Any changes in the source are instan-
taneously observed in the response. In this section we examine the inductor, a passive ele-
ment that relates the voltage-current relationship with a differential equation. Circuits that
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