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Does the length of a wire affect the resistance? -- A* - page 6
Keywords: Physics length of wire resistance
By georgie1 on 31/12/2009
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 6 of 6 pages: 1 2 3 4 5 6electronically, the readings are therefore very accurate. The ruler measures in degrees of millimetres (mm), which ensures that each centimetre is extremely precise and that I measure very accurately.
If I was to repeat the experiment, I might include longer lengths of wire, possibly up to 3.00 metres. This way, I would be able to clearly see a wider range and a more significant pattern in the resistance across the wire. This would provide me with a much more reliable and firm conclusion. I might also measure different materials of wire [such as copper and silver], to see if there were any other correlations between the resistance and length. I might measure the length of time that the resistance readings were taken in so that the temperature of the wire is consistent (if a current is flowing for longer period of time then the wire will have a higher temperature and will therefore cause the negatively charged electrons to move less easily past the positively charged ions). I might also attach equal weights to either end of the resistance wire and keep them of the same weight throughout the investigation to maintain the tension [tautness] of the wire, so that particles were evenly spread (and not more spread out or compact). I could then draw a conclusion in more depth to see exactly what wire is most/least resistant.
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