Aim: To Find Out How Resistance Varies In A Length Of Wire - page 5
Keywords: To Find Out How Resistance Varies In A Length Of Wire , Resistance, Ohms Law, Electrons Positive Nuclei
By Mose. on 01/09/2008
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 5 of 5 pages: 1 2 3 4 5
co-ordinated the way in which I chose the measurements I was going to use for before attempting my experiment. By doing this it made the real investigation run smoothly, as I knew I wouldn’t come across any further problems with my equipment or investigation. The preliminary work enabled me to find out, about how temperature affected the amount of resistance in a wire, this in turn made my results fair and accurate. I was really happy with my results as they contained no anomalies, which was backed up by my graph. I also think that the repeats of my experiments made the experiment to have a suitable degree of accuracy. However , my results could be more accurate as I didn’t get the expected 2.22of resistance at 50 cm. Reasons for this slight error could be due to the fact, that the crocodile clips were not correctly and accurately placed on the 50cm line. Also the lack of quality in my equipment, as the wire I was using was somewhat “bendy” and contained a few kinks at certain points which could have altered the overall length of the wire. The crocodile clips I was using, were a little bit too big for the wire, and therefore could have easily slipped wide of my required measurements. Again I think that my inability to control the temperature as accuratetly as possible in the shorter lengths of wire may have also been a factor for my lack of accuracy in some results. (e.g. 50cm = 2.56 should be 50cm = 2.22) If I were to this experiment again I would most certainly put the errors stated above correct, and also I would use compare my results to another type of wire and see if there were any discrepancies, in the results.
To conclude I think that this investigation was a successful one, despite my lack of complete accuracy in some results I still was able to establish that the rate of resistance depends on the length of the wire, or in other cases could depend on the diameter and type of metal used for the wire.
In future I think a concluding experiment would be how the resistance behaves in different metals and materials in the following table. I would then compare results to this experiment and provide an analytical explanation of my findings.
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