ECE 2300 – CIRCUIT ANALYSIS
HOMEWORK #2
Notes
a)
Power terminology: In class we use the terms “delivered” and “absorbed” to indicate the
direction of power flow.
For example, the battery in a flashlight “delivers” electrical
power to the bulb; the bulb “absorbs” electrical power.
Nilsson/Riedel uses various
terms: “supplied” is equivalent to “delivered”, and “dissipated” is equivalent to
“absorbed”.
They also use the term “developed” to mean either case, that is, they want
you to calculate the power in each circuit element, and find out whether positive power is
delivered or absorbed.
Then, take the values of the power expressions for positive power
absorbed and add these results.
Do the same thing for the power expressions for power
delivered.
These two sums should be equal.
Each sum is equal to the power developed
in the circuit.
b)
In class we defined “ideal” voltage and current sources.
Real voltage and current sources
(the kind you actually buy or build) do not behave like ideal sources.
Nilsson/Riedel
refers to “practical constant current” and “practical constant voltage” sources to describe
the way real sources behave.
The data table in Problem 2 below is imagined to have been
taken on “real” sources, as opposed to “ideal” sources. That problem asks you to
construct a circuit model of the practical voltage source, which can be modeled as an
ideal voltage source in series with a resistor. Problem 3 below asks you to model a device
as a practical current source, which can be modeled as an ideal current source in parallel
with a resistor.
1.
This problem comes from Dr. Shattuck’s computerassisted learning project, which is found
on the engineering domain at \\Laser\UHCourses\Ece2300\Dr_Dave_Project.
Note that this
directory cannot be accessed from the web; you will need to access it from the Engineering
Computer Center (ECC), or from another location that allows you access to the domain folders.
When you find the directory, do the following.
a)
Open the file
DPKC_Mod01_Part01_v07.ppt
and view the slide show found there.
This
is best done by putting the presentation in Slide Show Mode: from the menu, click on
“Slide Show”, and then “View Show”.
Clicking the mouse or pressing the space bar will
take you through the slide show.
Based on what you have seen, write one or two
sentences to answer the question, “Why bother with Reference Polarities?” Remember
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 Fall '08
 Staff
 device, Voltage source, Current Source

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