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1-4The graph shows is current is increasing when the voltage is increasing. The graph is proved the Ohm's law.2-1Procedure 4P=V2/R=102V/100 ohms=1WProcedure 6P=I2R=0.12A×250 ohms =2.5W2-2Procedure 8P=VI=25V×0.03A=0.75WProcedure 9
P=VI=25V×0.015A=0.375WProcedure 10P=VI=25V×0.0599A=1.4975WComparing 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 11P= V2/R=102V/200 ohms=0.5WProcedure 12P= V2/R=202V/200 ohms=2WProcedure 13P= V2/R= 52/200 ohms=0.125WComparing 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 ishalved of the original. ErrorThe wire has resistance which can affect the results. The measurement of voltage and current may have error due to instrument limit. ConclusionTherefore, the experiment has proved the ohm's law.