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Your Name: _______________________(
1pt
)
Prelim 1
ECE 2100, spring 2010, Professor Molnar
The exam will last 3 hours, you are permitted 1 singlesided 8.5”x11” crib sheet
to be
turned in for 9pts
.
You may also use a calculator.
Scrap paper is provided and should
be attached: show your work for partial credit.
However,
answers should be written in
the space provided: if we have to go looking for your answer, you will lose 1 point
off that answer!
If you get stuck on any given part, move on, and come back later.
1)
(5 pts)Your incompetent lab partner drops all your LEDs on the floor.
The
colored ones are easy to tell apart, but you have an ultraviolet one and an infered
one, and they both look black to you no matter how much current your partner
runs through them.
How could you use an SMU to tell them apart?
(2 sentences).
2)
(10 pts) Apply superposition to the circuit below to find V1, V2, and V3 first in
terms of Id, Ic and Vb, then numerically, assuming R = 1k
Ω
, Id=200
μ
A, Ic=1mA
and Vb=3V.
V1 = ___________________ = _____________________
(equation)
(number)
V2 = ___________________ = _____________________
(equation)
(number)
V3 = ___________________ = _____________________
(equation)
(number)
V1
V2
Id
Ic
Vb
R
R
R
R
V3
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View Full Document3)
Consider the nasty circuit below: it is loaded by resistor RL
a.
(7 pts)Write, but do not solve, the node voltage equations for this circuit in
terms of I
in
, R, V1, V2, V3, V4 and R
L
.
Eq for node 1: ____________________________________________
Eq for node 2: ____________________________________________
Eq for node 3: ____________________________________________
Eq for node 4: ____________________________________________
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 Spring '05
 KELLEY/SEYLER

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