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The Effect Of Wire Length On Resistance

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The Effect Of Wire Length On Resistance


To find out the effect of wire length on Resistance.

I will do this by using a long piece of wire and by using Voltmeters and Ammeters and measuring the current at different lengths.


I predict that the longer the length of the wire is, the higher the resistance will be. I believe that this will happen because of the following example:

If there are two pipes, one is bigger than the other. The water is travelling through the bigger one and all of a sudden it starts travelling through the smaller one, the amount of water that passes through will be less than the amount that passes through the bigger one, this is because of the size. This is similar to our experiment, because the measurements will be taken at different lengths (longer each time [similar to larger pipe] ) so the resistance will be greater as the current [water] flows the the wire.


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A 5.66                A 2.82                A 1.99                A 1.42                A 1.23

Now what I have found my results, I have to work out my average resistance for each. I do this by dividing the voltage by the current, I do this for all three results that I get per each measurement. Below are my results, with the calculations:


2.50V / 5.48 = 0.45

 2.50V / 5.83 = 0.42

 2.50V / 5.66 = 0.44

0.45 +

0.42 +


-----                                 1.31 divided by 3 = 0.43

1.31                              Average resistance for 5cm is 0.43



2.50V / 2.80 = 0.89

2.50V / 0.88 = 0.88

2.50V / 0.88 = 0.88

0.89 +

0.88 +


-----                        2.65 divided by 3 = 0.88

2.65                          Average resistance for 10cm is 0.88

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To improve my experiment, I could do the following things:

  1. Do the experiment again. This time round, I will take note and try to achieve the above pointers (in my conclusion) so that I can get more accurate results and a better understanding of the test.
  1. Try the experiment on a different type of wire, such as thicker, longer, shorter and even a different material. This would be for a much broader understanding of the resistance in different types of wire. This would almost certainly differ from my own results as the wire would be different to the one that I used in the test.

I could also try to be more practical and do the experiment more times and more carefully, i.e safer, slower, measurements carefully and voltage the exact same each time.

To get the 'perfect result', I could compare my results with other people results and see who is closer to getting the most accurate line of best fit; this would also correct any anomalies in my graph and would give me a better overall result.

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This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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