1 4 the graph shows is current is increasing when the

1-4
The graph shows is current is increasing when the voltage is increasing. The graph is proved the Ohm's
law.
2-1
Procedure 4
P=V 2 /R=10 2V /100 ohms=1W
Procedure 6
P=I 2 R=0.1 2 A×250 ohms =2.5W
2-2
Procedure 8
P=VI=25V×0.03A=0.75W
Procedure 9

P=VI=25V×0.015A=0.375W
Procedure 10
P=VI=25V×0.0599A=1.4975W
Comparing the calculated results of power, the results is showing the power is halved when the
resistance is doubling in procedure 9 and the power is doubling when resistance is halved in procedure
10.
2-3
Procedure 11
P= V 2 /R=10 2 V/200 ohms=0.5W
Procedure 12
P= V
2
/R=20
2
V/200 ohms=2W
Procedure 13
P= V 2 /R= 5 2 /200 ohms=0.125W
Comparing the calculated results of power, the results is showing the power is four times when the
voltage is doubling in procedure 12. And the power is quarter of the original when the voltage is
halved of the original.
Error
 The wire has resistance which can affect the results.
 The measurement of voltage and current may have error due to instrument limit.
Conclusion
Therefore, the experiment has proved the ohm's law.