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Investigating what affects the resistance of a piece of wire

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Investigating what affects the resistance of a piece of wire? Plan In this experiment I plan to find out what factors effect the resistance of a piece of wire.. Depending on the different material electricity will either find it very easy to move because there is a high amount of free electrons producing a low resistance, Alternatively it is difficult to move because there are hardly any or no free electrons. This means there is a high resistance. Energy is passed into free electrons and it stays there until it is passed onto another free electron. This is the electricity being conducted. An electron can lose some of its energy if it collides with another electron. This is the product of resistance. Variables The factors in this are the thickness; length and which metal the wire is made from. The thickness of wire because in thinner wire there will be more resistance because it will be harder for electrons to move about in it. The length because in a longer piece of wire there will be higher resistance because the flow will have to go further having to overcome more obstacles e.g. ...read more.


Copper Constantan Nichrome - - 22 32 32 32 34 - 36 Pre-Test Test Results Type Thickness Length Current Voltage Resistance Cu 34 10 2.00 0.33 0.165 Cu 34 20 1.86 0.39 0.209 Nichrome 32 10 0.53 1.05 1.981 Nichrome 32 20 0.30 1.21 4.033 Constantan 32 10 0.20 0.13 0.650 Constantan 32 20 0.20 0.36 1.8 Results Our group has decided that we are going to investigate what effect the length of the wire has on the resistance using Constantan 32. We have decided to use this wire because unlike other wires the current stays the same no matter what length it is, as you can see from my results table above. To achieve a good range of results I am going to use a selection of lengths, the difference between these lengths will be 5cm and the longest length of wire is going to be 50cm. This range will ensure I will get an sufficient range of results that will show a good legend in my graph, confirming my prediction. To maintain a fair test I must keep the distance between each length of wire the same. ...read more.


There is a few reasons why I may have got anomalous results in my test. There is the possibility that the batteries may have just been running out so were on low power or the wires had a small fault in them. This would mean the current was not as big which would affect my results. Therefore that means if we changed the experiment in some way it may have caused it to become less accurate. If we had the resources then we would use all new equipment to perform out experiment e.g. new batteries, new wires, and new ammeter/voltmeter. As this was not possible we had to use the materials we had, this could have been the fault in our experiment. As always, if we had more time then we could perform the experiment over and over again with the same lengths to get a more accurate result, this would also give us a much better range of results for each length because just one or 2 for each is not as reliable as 10 for each for example. This would result in so many decimal places that there would be no point. We could also do longer lengths to prove the theory that length is directly proportional to the resistance. If we had dome the experiment ...read more.

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