Physics 152 Lab # 4
Charging and Decay in RC Circuits
Section #12 – Adita Gokhale
Abstract:
This lab looked at the loss of charge on the capacitor after charging it to the max.
By collecting time and corresponding voltage over the capacitor allows the capacitor
discharge to be measured. The value of
that was expected for the first part of the
τ
experiment was 84.6 the value received through the ln(voltage) vs. time graphs slope was
81.3 which was with in the possible 5% of the capacitor. With the later experiments the
set up was a bit different using the oscilloscope to measure the units (or the maximum
possible value) then multiply by 0.67 to determine where the value would first equal
.
τ
Lab 4 Questions:
1.
What is your experimental value of
for part B in the lab manual? How does
τ
this compare to the theoretical value of
? Explain any discrepancy. Please attach
τ
the corresponding graph.
The theoretical value for part B is =
τ
RC which equals to 300K ohms resistor * 282
μF => 300,000* 282*(10^6) = 84.6 with in +/ 5% of that value. The experimental value
is the slope of the graph = 1/
= /RC. So 0.0123 = 1/
so
= 1/0.0123 = 81.3 now to
τ
τ
τ
checking if within the possible values (84.6 – 81.3)/ 84.6  *100 = 3.9% error.
So this
values falls into the possible range of the capacitor.
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 Spring '09
 DINSMORE
 Physics, Science, Charge, RC Circuits, #, Adita Gokhale

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