the rc circuit

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:

.02

.05

.07

.10

.144

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.

.045 sec

.032 sec

.010 sec

.005 sec

Table of current vs. clock time using same resistor as before, again starting with 4 volts +- .02 volts.

Times to fall from initial current to half; 75% to half this; 50% to half this; 25% to half this, based on graph.

1.0 sec

.07 sec

.05 sec

.046 sec

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?

there is a little similarity.

they are close to the same going from voltage to voltage

there is a bit of a pattern here.

Table of voltage, current and resistance vs. clock time:

I got the values by using the timer method and seeing how long it takes the voltages to go from one to another.

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.

5 volts

Values of t / (RC), e^(-; t / (RC) ), 1 - e^(- t / (RC)) and V_source * (1 - e^(- t / (RC) ).

6, 4, 8, 12

I am not sure how to explain my results and I am not even sure if I did it correctly or not.

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?

about an thirty minutes or so for just what I did. I don't understand this much at all and I just feel like it is a lot of information to grasp for just one lab.

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