MAE140 Linear Circuits Fall 2006
Quiz. Thursday October 19 in class, 80 minutes
Instructions
This quiz is open book. You may use whatever written materials you choose including your
class notes and the textbook. You may use whatever calculator you desire, provided it has no
messaging communications capability, including infrared, radio and other wireless technol
ogy.
You should attempt to answer all question parts.
They are equally valued.
You have 80
minutes.
Please mark your papers with your name, surname first, and student number.
HINTS:
 Read the questions very carefully.
Answer the questions asked and do not second guess
some presumed meaning. Generally, take my hints.
 If I instruct you to use a particular method then do so. Thus, if I say
use nodal analysis
then
use nodal analysis and do not use mesh analysis.
 Marks are awarded for methods, concepts and expression of ideas. Do not devote too much
time to complicated algebraic manipulations.
 Because I give you the answers, you will need to show the working in some detail in order to
gain marks.
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Question 1: Th´evenin Equivalent Circuits [Thomas & Rosa 353]
Figure 1: Bridge circuit for computation of Th´evenin equivalent, Question 1.
Find the Th´evenin equivalent circuits as seen by the load resistor
R
L
. Do this as follows.
Part (i):
With
R
L
removed, compute the opencircuit voltage between points
A
and
B
.
Part (ii):
With
R
L
replaced by a short circuit (i.e. a piece of wire), use mesh analysis to show
that the currents in the three loops satisfy,
90

30

60

30
50
0

60
0
80
i
1
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 Fall '04
 Mauricio
 Electrical impedance, Thévenin's theorem, Voltage source, Norton's theorem, Th´ venin

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