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ECE 2300 – Final Exam
May 3, 2006
Keep this exam closed until you
are told to begin.
1.
This exam is closed book, closed notes.
You may use one 8.5” x 11” crib
sheet, or its equivalent.
2.
Show all work on these pages.
Show all work necessary to complete the
problem.
A solution without the appropriate work shown will receive no
credit.
A solution that is not given in a reasonable order will lose credit.
Clearly indicate your answer (for example by enclosing it in a box).
3.
It is assumed that your work will begin on the same page as the problem
statement.
If you choose to begin your work on another page, you must
indicate this on the page with the problem statement, with a clear indication
of where the work can be found.
If your work continues on to another
page, indicate clearly where your work can be found.
Failure to
indicate this clearly will result in a loss of credit.
4.
Show all units in solutions, intermediate results, and figures.
Units in the
exam will be included between square brackets.
5.
Do not use red ink.
Do not use red pencil.
6.
You will have 180 minutes to work on this exam.
1.
________________/10
2.
________________/18
3.
________________/12
4.
________________/24
5.
________________/18
6.
________________/18
Total = 100
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ECE 2300 – Final Exam – May 3, 2006 – Page 2
1.
{10 Points} A number (n) of identical devices, consisting of a voltage source
E
0
and a resistor
R
=1[k
Ω
], are connected in parallel, and then connected in parallel
with the resistor
Rp
=90[
Ω
], as shown in Figure 1.
If an ammeter with a meter
resistance R
m
= 1[
Ω
] is connected in to the circuit at point G, find the number of
devices n that must be connected in parallel so that the magnitude of the error of
the current measurement is not bigger than 1%.
Your solution should be expressed
as an inequality.
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 Spring '08
 Staff
 Resistor, Electrical resistance, Electrical impedance, Series and parallel circuits, Voltmeter

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