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AA320 – Aerospace instrumentation
Prelab Assignment for Lab 3 – Week of October 17, 2011
Please work through these problems
before
your lab session.
1)
Inductors:
The following
LR
low pass filter is supposed to attenuate (reduce the amplitude
of) a 10 kHz input signal by a factor of 5.
What value of
L
is required for the inductor?
2)
Transformers:
Consider a stepdown transformer to convert 120 VAC (wallplug voltage)
to 15 VAC.
Both voltages are rms
values.
What is the ratio of number of turns on secondary to primary (
n
s
/n
p
)?
What is the amplitude
of the secondary voltage?
What is the peaktopeak
voltage on the secondary?
If a 3 k
Ω
resistor were connected to the secondary what would be the average
power
dissipated by the resistor?
What would the peak
power be?
With this resistor in place, what would the peak
current be in the primary (coming from your
wall plug)?
3)
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 Fall '09
 Alternating Current, power supply, Switchedmode power supply, output voltage

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