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10 V
100 k
Ω
V
OUT
150 k
Ω
50V
X
+
_
1 k
Ω
2.2 k
Ω
+
_
V
X
+
_
I
X
R
IN
I
IN
V
IN
Lesson 13 – Dependent Sources #1
(Sections 41 and 42) (CLO 41)
This and the next lesson are very important to the students’ understanding of electronic modeling –
especially the OpAmp section that follows.
Some students do not appreciate what a dependent
source is.
It is important that they realize that a dependent source behaves like an independent
source in every way with the exception that its “value” is not fixed but rather varies directly with a
voltage or current elsewhere in the circuit – hence, it “depends” on another parameter.
We also
NEVER set a dependent source to zero. For example, when finding Thévenin equivalents we do not
use the “lookback” method because it can give an incorrect result.
Begin by telling the students that Dependent Sources are models – mathematical artifacts.
They
cannot be bought at Radio Shack or on the web.
Rather they are useful tools for understanding the
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 Spring '08
 MAURICIODEOLIVERIA

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