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# How does the length of wire affect the resistance around a circuit?

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Introduction

Michael Ritchie 10E        Psychics Coursework        Mr Brooks

How does the length of wire affect the resistance around a circuit?

I am planning this investigation to find out if the length of wire in a circuit affects the resistance in it. I will need an understanding of electricity, resistance and, probably, voltage.

I predict that the longer the piece of wire, the more resistance there will be. I will keep the material, diameter, temperature and voltage being passed through it the same. I shall use nichrome wire and make it lengths of 100cm, 90cm, 80cm, 70cm, 60cm and 50cm and so on until 20cm. This way I can see if it changes with an extra 80cm in between. I will pass 3V through the wire.

Middle

60

0.93

0.81

1.15

50

0.82

0.87

0.94

40

0.69

0.93

0.74

30

0.62

1.02

0.61

20

0.54

1.10

0.49

The results in the preliminary results were very good and they were no anomalies. Below are my actual results.

 Length (cm)

Conclusion

The procedure was very good and I thought I worked well. The evidence obtained is pretty reliable but dents and bends in the nichrome wire may have affected it. Some measuring may have been slightly dubious as well so this is likely to influence it. I could make some changes to this. Repeating the experiment once or twice more could have given me a more accurate readings. The evidence could support a perfectly good conclusion, because even though there is one anomaly, it still follows in with the pattern. I could try a second experiment but changing perhaps cross-sectional area or temperature to see how that impinges on my table of results.

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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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