#$&*
Phy 122
Your 'the rc circuit' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
#$&* Your comment or question: **
5/13
#$&* Initial voltage and resistance, table of voltage vs. clock time: **
4.02, 33
32.93, 3.5
72.12,3.0
127.46,2.5
192.87,2.0
281.38,1.5
409.96,1.0
502.47,0.75
634.42,0.5
864.9,0.25
#$&* 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. **
32.93
209.26
217.46
224.46
#$&* Table of current vs. clock time using same resistor as before, again starting with 4 volts +- .02 volts. **
12,51.77
10,207.41
6,432.72
3,657.01
1.5,919.01
#$&* Times to fall from initial current to half; 75% to half this; 50% to half this; 25% to half this, based on graph. **
380s
200
225s
262s
#$&* Within experimental uncertainty, are the times you reported above the same?; Are they the same as the times you reports for voltages to drop from 4 v to 2 v, 3 v to 1.5 v, etc?; Is there any pattern here? **
These are very similar to the times that it requires for voltage to drop.
#$&* Table of voltage, current and resistance vs. clock time: **
#$&* Slope and vertical intercept of R vs. I graph; units of your slope and vertical intercept; equation of your straight line. **
#$&* Report for the 'other' resistor:; Resistance; half-life; explanation of half-life; equation of R vs. I; complete report. **
#$&* Number of times you had to reverse the cranking before you first saw a negative voltage, with 6.3 V .15 A bulb; descriptions. **
#$&* When the voltage was changing most quickly, was the bulb at it brightest, at its dimmest, or somewhere in between? **
#$&* Number of times you had to reverse the cranking before you first saw a negative voltage, with 33 ohm resistor; descriptions. **
#$&* 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. **
#$&* Voltage at 1.5 cranks per second. **
#$&* Values of t / (RC), e^(-; t / (RC) ), 1 - e^(- t / (RC)) and V_source * (1 - e^(- t / (RC) ). **
#$&* Your reported value of V(t) = V_source * (1 - e^(- t / (RC) ) and of the voltage observed after 100 'cranks'; difference between your observations and the value of V(t) as a percent of the value of V(t): **
#$&* According to the function V(t) = V_source * (1 - e^(- t / (RC) ), what should be the voltages after 25, 50 and 75 'beeps'? **
#$&* Values of reversed voltage, V_previous and V1_0, t; value of V1(t). **
#$&* How many Coulombs does the capacitor store at 4 volts? **
#$&* How many Coulombs does the capacitor contain at 3.5 volts?; How many Coulombs does it therefore lose between 4 volts and 3.5 volts?; **
#$&* 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? **
#$&* According to your data, what was the average current as the voltage dropped from 4 V to 3.5 V?; How does this compare with the preceding result, how should it compare and why? **
#$&* How long did it take you to complete the experiment? **
too long
** **
I honestly can't do anymore. I am burned out like the fuze on my multimeter could be if I measured amps in parallel.
self-critique rating
rating #$&*:
#$&*
@& I hope you've been able to recharge a bit, just for your sake.
You did an impressive amount of work in a short time. Despite running out of gas near the end, you have a good lab average.
Tests will be graded and scores posted by tomorrow night.*@