Fair Testing
Some factors will affcet the final result if they are not taken care of, or if you do not take precutions. Some of the factors that will most probably affect the final results are: I will have to keep the standard wire gage the same through out the whole experiment, I will also have to keep the voltage the same otherwise it might affect the results, however the most important factor I will have to look out for is the temperature 'As temperature increases, resistance of wire increases' if the temperature changes the resistance will change with the temperature, this factor may affect my results significantly, and there may be nothing to stop this factor affecting my results.
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