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Analysis and Evaluation - page 1
Keywords: a level gcse physics analysis
By Mehak on 10/03/2011
Level: A Level (Year 13)
Page Number: 1 of 3 pages: 1 2 3Combination is 22µF with 3.3M
Voltage =9.45
Time (seconds) Current (amperes)
1st attempt 2nd attempt Average
0 2.80 2.80 2.80
10 2.30 2.30 2.30
20 2.00 1.90 1.95
30 1.70 1.80 1.75
40 1.50 1.50 1.50
50 1.30 1.20 1.25
60 1.10 1.10 1.10
70 1.00 1.00 1.00
80 0.80 0.90 0.85
90 0.70 0.70 0.70
100 0.60 0.60 0.60
110 0.50 0.40 0.45
120 0.40 0.40 0.40
130 0.30 0.30 0.30
140 0.20 0.20 0.20
150 0.20 0.10 0.15
Analysis:
After collecting and analysing my results I have come to conclude that my prediction is right.
The graph shows overall an exponential behaviour. However not all the point has fit in the line therefore it seems to be having anomaly results at time intervals 0s where the current is 2.80 amps, 10s where the current is 2.30 amps, 20s where the current is 1.95 amps. Whereas at time 70s, 80s, 90s where the current is 1.00 amps, 0.85 amps, 0.70 amps respectively is very closer to the best fit line. Overall the graph proves that the capacitance is directly proportional to the time taken to discharge a capacitor
Combination is 2200µF with 33k
Voltage =9.27
Time (seconds) Current (amperes)
1st attempt 2nd attempt Average
0 2.82 2.80 2.81
10 2.40 2.39 2.40
20 2.16 2.16 2.16
30 1.89 1.89 1.89
40 1.67 1.66 1.67
50 1.46 1.46 1.46
60 1.26 1.26 1.26
70 1.15 1.14 1.15
80 1.01 1.00 1.01
90 0.85 0.87 0.86
100 0.73 0.73 0.73
110 0.65 0.64 0.65
120 0.58 0.57 0.58
130 0.51 0.49 0.50
140 0.47 0.47 0.47
150 0.41 0.41 0.41
Analysis:
Once again I can clearly see that my prediction proves to be correct as it can be seen the graph showing an exponential function thus proving my prediction correct.
As I can see the graph does not have any anomaly results this is probably because the combination of capacitor and resistor was good enough to prove the theory correct without having any anomaly results.
Combination is 470µF with 220k
Voltage =9.19
Time (seconds) Current (amperes)
1st attempt 2nd attempt Average
0 43.30 43.20 43.25
10 39.20 39.20 39.20
20 34.10 34.20 34.15
30 31.00 31.00 31.00
40 28.50 28.10 28.30
50 25.50 25.50 25.50
60 23.40 23.60 23.50
70 19.90 20.00 19.95
80 18.70 18.60 18.65
90 17.10 17.00 17.05
100 15.20 15.20 15.20
110 12.90 12.80 12.85
120 12.10 12.00 12.05
130 11.40 11.50 11.45
140 10.10 10.20 10.15
150 9.20 9.30 9.25
Analysis:
Combination is 33µF with 4.7M
Voltage =9.55
Time (seconds) Current (amperes)
1st attempt 2nd attempt Average
0 2.00 2.00 2.00
10 1.80 1.90 1.85
20 1.60 1.60 1.60
30 1.50 1.50 1.50
40 1.40 1.40 1.40
50 1.20 1.30 1.25
60 1.10 1.20 1.15
70 1.00 1.10 1.05
80 0.90 0.90 0.90
90 0.80 0.80 0.80
100 0.80 0.80 0.80
110 0.70 0.70 0.70
120 0.60 0.70 0.65
130 0.60 0.60 0.60
140 0.50 0.40 0.45
150 0.50 0.30 0.40
Combination is 33µF with 3.3M
Voltage =9.50
1st attempt 2nd attempt Average
0 2.8 2.8 2.8
10 2.5 2.6 2.55
20 2.2 2.2 2.2
30 2.0 2.1 2.05
40 1.7 1.7 1.7
50 1.5 1.5 1.5
60 1.4 1.4 1.4
70 1.2 1.3 1.25
80 1.1 1.1 1.1
90 1.0 1.0 1
100 0.9 0.9 0.9
110 0.8 0.8 0.8
120 0.7 0.7 0.7
130 0.6 0.6 0.6
140 0.5 0.6 0.55
150 0.4 0.4 0.4
Combination is 33µF with 2.2M
Voltage =9.60
Time (seconds) Current (amperes)
1st attempt 2nd attempt Average
0 4.3 4.3 4.3
10 3.6 3.7 3.65
20 3.0 3.1 3.05
30 2.6 2.6 2.6
40 2.3 2.2 2.25
50 1.9 2.0 1.95
60 1.6 1.6 1.6
70 1.2 1.2 1.2
80 1.0 1.1 1.05
90 0.9 0.8 0.85
100 0.7 0.7 0.7
110 0.6 0.6 0.6
120 0.5 0.5 0.5
130 0.4 0.4 0.4
140 0.3 0.2 0.25
150 0.2 0.1 0.15
Combination is 47µF with 2.2M
Voltage =
RC = 103.4
Evaluation:
My experiment went well enough to give me the consistent results from which a conclusion can be drawn that proves my prediction and scientific theory. However, my results are reasonably reliable as all of them were very close to the line of exponential.
I do consider my results is good enough to support my conclusion as most of them followed a steady pattern and showed that the larger the time constant is, the longer the capacitor will take to discharge also the bigger the capacitance, the longer amount of time it will take for the capacitor to discharge through a resistor and vice versa.
In terms of reliability the experiment was carried out 3 times for each combination of resistor and capacitor and then an average was taken out in order to find the current at different time intervals.
However if the experiment were to be carried out again changes could be made to reduce experimental error.
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