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How the Length of a Wire Affects Its Resistance In my physics coursework I am going to investigate the effect of the length of a wire on its resistance Resistance is the measure of how easy it is for current to flow through a wire Current is the rate of flow of charge through a conductor and it is measured in amps using an ammeter To help me plan my investigation I have completed a preliminary experiment in which I investigated the effect of the thickness of a wire on its resistance using three constantan wires and one copper wire I found that the resistance increased as the thickness of the wire decreased however when I did the test with the copper wire I found that it was so unresistant that there would not be a lot of point in conducting my experiment using a copper wire because I would not really be able to compare the results I therefore decided to use a wire of a higher resistance constantan because it will allow me to get more reliable and comparable results Preliminary experiment results Wire typediameterResistance W Copper 02mm18 W Constantan 02mm91 W Constantan 045mm5 W Constantan 09mm18 W Diagram The things that I will measure and observe are the voltage running through the wire and the current This will allow me to calculate the resistance of the wire To calculate the resistance of the wire I will divide the voltage V by the current I which will give me the resistance in ohms W Equipment The equipment that I will use is -power pack -ammeter -voltmeter -30 SWG diameter constantan wire -1 metre ruler -leads -crocodile clips Method This is exactly what I will do 1I will set up my experiment as shown
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