Method 4
capacitor
Figure 2 show that capacitor was connected to multi-meter to measure the capacitance of the capacitor.
The value of the capacitance that is shown in the multi-meter was 4.357μF, but the stated capacitance of the capacitor is 4.7 μF. Since there’s not much difference in the calculation result, we can conclude that this method is more accurate than method 1.
Method 5
Figure 3:
C
Figure 3 shows how the circuit was assembled.
Table 1.
t(s) |
Voltage（V） |
Capacitance(F) |
0.5 |
0.88 |
5.28E-07 |
1 |
0.26 |
7.03E-07 |
1.5 |
0.15 |
9.16E-07 |
2 |
0.071 |
1.04E-06 |
2.5 |
0.04 |
1.16E-06 |
3 |
0.033 |
1.35E-06 |
3.5 |
0.028 |
1.53E-06 |
4 |
0.02 |
1.65E-06 |
4.5 |
0.019 |
1.84E-06 |
5 |
0.018 |
2.03E-06 |
5.5 |
0.016 |
2.19E-06 |
6 |
0.014 |
2.34E-06 |
6.5 |
0.013 |
2.51E-06 |
7 |
0.012 |
2.67E-06 |
7.5 |
0.011 |
2.82E-06 |
8 |
0.01 |
2.97E-06 |
8.5 |
0.009 |
3.11E-06 |
9 |
0.008 |
3.24E-06 |
9.5 |
0.008 |
3.42E-06 |
10 |
0.007 |
3.53E-06 |
10.5 |
0.007 |
3.71E-06 |
11 |
0.006 |
3.80E-06 |
11.5 |
0.006 |
3.97E-06 |
12 |
0.006 |
4.15E-06 |
12.5 |
0.006 |
4.32E-06 |
13 |
0.006 |
4.49E-06 |
13.5 |
0.005 |
4.55E-06 |
14 |
0.005 |
4.72E-06 |
14.5 |
0.005 |
4.89E-06 |
15 |
0.004 |
4.92E-06 |
15.5 |
0.004 |
5.08E-06 |
16 |
0.004 |
5.24E-06 |
16.5 |
0.004 |
5.41E-06 |
17 |
0.004 |
5.57E-06 |
Graph 1.
In method 5, for help like in method 2 was used video camera, to record values of voltage of resistance. First of all, before resistance was connected to capacitor, capacitor was charged. Capacitor was charged with a voltage ≈ 20V and it was charged ≈ 10-15 seconds. After that, when capacitor was charged enough, capacitor was putted into the system which was make before. Camera fixed values of Voltage and time on the timer (Table 2 shows results). In method 5 shows effect like discharge of the capacitor. Charge of capacitor going throw the resistor and because of that going discharge of capacitor. In table 2 shows that voltage in the end was equal only 0.4, it is mean that disgorging of the capacitor was not perfect and something do not give to capacitor discharge finally.
Capacitance of the capacitor was calculated from formula which was written in the beginning: .
Was did some transformation with that formula:
So,
it is mean that:
