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There are different factors that affect the resistance of a wire: * Length * Thickness * Temperature * Voltage * Material I am going to do two experiments in this investigation. In experiment one I am going to investigate how the resistance of a wire depends on its length. In experiment two I am going to investigate how the resistance of a wire depends on its thickness. I have chosen to investigate these two factors because they are the easiest to control, so therefore my results can be more accurate. I know that resistance can be calculated with this equation: Resistance (ohms) = voltage (in V) current (in A) Experiment One First a length of wire, made out of copper, which is over a metre long, is cello-taped to a metre rule. One crocodile clip is attached at 0cm and the other crocodile clip is moved up and down the wire to different lengths: 10, 20,...

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