Problem 1
You work for a startup, Ohm’s World, which makes demo circuits for engineering labs.
The circuit designer, Shanelle, on your team is currently on vacation, and you are the
only member with circuit experience.
Your boss sends you the following memo:
URGENT!!!!!!!! Job Order #314
How does this thing work? What’s its status? I need to know NOW!
You take a look at job order #314:
We need a temperature control circuit that turns a fan on when the temperature
gets above a certain threshold.
You take a look at Shanelle’s work, and the following circuit and note is all you can find:
V
S3
is positive and is a
fixed voltage source.
V
T
of MOSFET is 2V.
I still need to replace
the voltage source
models with actual
components. Between,
V
S1
and
V
S2
, one will
be a fixed source while
the other will be a
temperature sensor
whose voltage
difference increases
with increasing
temperature.
With the given objective and Shanelle’s work, what conclusions can you draw about the
circuit to make it work for your application?
A.
V
S1
is the sensor and
V
S1
>0
while
V
S2
is the fixed source and
V
S2
>0
B.
V
S1
is the fixed source and
V
S1
>0
while
V
S2
is the sensor and
V
S2
>0
C.
V
S1
is the sensor and
V
S1
<0
while
V
S2
is the fixed source and
V
S2
>0
D.
V
S1
is the fixed source and
V
S1
<0
while
V
S2
is the sensor and
V
S2
>0
E. This circuit will never work for the job order objective
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 Spring '09
 Ganago
 Resistor, SEPTA Regional Rail, Voltage drop, voltage difference increases

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