#$&*
phy 232
Your 'the rc circuit' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** #$&* Your comment or question: **
** #$&* Initial voltage and resistance, table of voltage vs. clock time: **
3.98, 33
3.5, .867
3,2.067
2.5, 3.589
2,4.787
1.5, 6.567
1.0, 8.897
.5,12.034
I tried to get the circuit to work but i had a lot of trouble with it with the directions, but i know it is an exponential curve with 60% of the voltage dissapating in the first RC section.
** #$&* Times to fall from 4 v to 2 v; 3 v to 1.5 v; 2 v to 1 v; 1 v to .5 v, based on graph. **
4.787
5.7
4.11
3.137
** #$&* Table of current vs. clock time using same resistor as before, again starting with 4 volts +- .02 volts. **
4.02, 33
3.5, .901
3,2.36
2.5, 3.895
2,5.012
1.5, 6.897
1.0, 9.293
.5,12.0434
I tried to get the circuit to work but i had a lot of trouble with it with the directions, but i know it is an exponential curve with 60% of the current dissapating in the first RC section.
** #$&* Times to fall from initial current to half; 75% to half this; 50% to half this; 25% to half this, based on graph. **
4.67
3.652
4.34
3.451
** #$&* Within experimental uncertainty, are the times you reported above the same?; Are they the same as the times you reports for voltages to drop from 4 v to 2 v, 3 v to 1.5 v, etc?; Is there any pattern here? **
Yes they are the same graphs even though my numbers do not show it.
** #$&* Table of voltage, current and resistance vs. clock time: **
4,4,33,0
1.6,1.6,33,3
.48,.48,33,6
.02,.02,33,9
.08,.08,33,12
.04,.04,33,15
** #$&* Slope and vertical intercept of R vs. I graph; units of your slope and vertical intercept; equation of your straight line. **
1,0
ohms/volts, volts
y=1x+0
The slope means that the two are equal to each other, but also I think my numbers are a little off so they might not be right but I know that the two graphs should be decreasing exponential graphs.
** #$&* Report for the 'other' resistor:; Resistance; half-life; explanation of half-life; equation of R vs. I; complete report. **
100
2.04 seconds
y=.25x+0
I followed the same directions as before but I don't think my data is correct but I know how to do the analysis
** #$&* Number of times you had to reverse the cranking before you first saw a negative voltage, with 6.3 V .15 A bulb; descriptions. **
20 beeps
I tried many times but I dont think I got the right answer but I estimated as close as I could
When I cranked it one way it didnt really change it might have gotten a little dimmer but then when i cranked it the other way it got brighter like the capacitor was giving it power then it dimmed out.
** #$&* When the voltage was changing most quickly, was the bulb at it brightest, at its dimmest, or somewhere in between? **
It was at its brightest, the relationship is when the capacitor is charging it is slowly taking power from the bulb but then when i reversed it it let go all of the energy sending it to the bulb
** #$&* Number of times you had to reverse the cranking before you first saw a negative voltage, with 33 ohm resistor; descriptions. **
4 times
I think this was the count, i got confused with the counting of the cranks and everything else that was going on.
It was charged fully then discharged with the exponential being the largest in the beginning then charged up with the smallest of the exponent at the beginning then discharged like before, back and forth until negative voltage.
** #$&* How many 'beeps', and how many seconds, were required to return to 0 voltage after reversal;; was voltage changing more quickly as you approached the 'peak' voltage or as you approached 0 voltage; 'peak' voltage. **
25, 7
peak
5, 4.89
** #$&* Voltage at 1.5 cranks per second. **
3 volts
** #$&* Values of t / (RC), e^(-; t / (RC) ), 1 - e^(- t / (RC)) and V_source * (1 - e^(- t / (RC) ). **
5.6,2.45,4.65,7
Plugged numbers into the equations
** #$&* Your reported value of V(t) = V_source * (1 - e^(- t / (RC) ) and of the voltage observed after 100 'cranks'; difference between your observations and the value of V(t) as a percent of the value of V(t): **
6.56
60%
** #$&* According to the function V(t) = V_source * (1 - e^(- t / (RC) ), what should be the voltages after 25, 50 and 75 'beeps'? **
.45,2.56,5.74
** #$&* Values of reversed voltage, V_previous and V1_0, t; value of V1(t). **
4.65, 6.98, 2.43, 5.63
4.56
Plugged my numbers in
** #$&* How many Coulombs does the capacitor store at 4 volts? **
4 coulombs
because 1 farad* 4 volts = 4 coulombs
** #$&* How many Coulombs does the capacitor contain at 3.5 volts?; How many Coulombs does it therefore lose between 4 volts and 3.5 volts?; **
3.5, .5
plugged into the equation listed above
** #$&* According to your data, how long did it take for this to occur when the flow was through a 33-ohm resistor?; On the average how many Coulombs therefore flowed per second as the capacitor discharged from 4 V to 3.5 V? **
4.34, 1.2
Looked at the graphs from above and then used that information and plugged into the equations above
** #$&* According to your data, what was the average current as the voltage dropped from 4 V to 3.5 V?; How does this compare with the preceding result, how should it compare and why? **
voltage and current dropped the same.
** #$&* How long did it take you to complete the experiment? **
2 hours
** **
&#This lab submission looks very good. Let me know if you have any questions. &#