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# How does the length of a wire affect's its resistance?

Extracts from this document...

Introduction

Year 10 coursework

Week beginning Monday 21st & ending Friday 28th

How does the length of a wire affect’s its resistance?

## Prediction

I predict that by keeping the voltage the same, the amp measurements will have a strong relationship, but by using only one voltage might be the subject of ohm’s law not to work. It may also be proven that by raising the length of the piece of wire the relationship between the resistance will be that, the longer the wire the less resistance happening.

## Equipments used

• Amp meter
• Volt meter (set at 4 volts)
• Power pack (also set at 4 volts)

## Experiment

After setting up the equipment, I set out the circuit provided on the board.

Middle

0.29

0.31

40

0.30

0.29

0.30

50

0.28

0.27

0.27

60

0.26

0.25

0.26

70

0.26

0.25

0.25

80

0.25

0.24

0.25

90

0.24

0.23

0.23

By looking at my results I came to the conclusion that my little theory was ‘the longer the piece of wire the smaller the resistance’ true but that wasn’t the end of my test. I had to find out how many ohms were in each measurement. But first I

Conclusion

 Length of wire (cm) Number of experiment 1 2 3 Resistance Average R=V/I 10 0.34 0.33 0.33 0.33 12.0 20 0.32 0.32 0.32 0.32 12.5 30 0.31 0.29 0.31 0.30 13.2 40 0.30 0.29 0.30 0.30 13.5 50 0.28 0.27 0.27 0.27 14.6 60 0.26 0.25 0.26 0.26 15.6 70 0.26 0.25 0.25 0.25 15.8 80 0.25 0.24 0.25 0.25 16.2 90 0.24 0.23 0.23 0.23 17.1

I then put these results in to a graph to get one looking like figure 1.2.

### Conclusion

By looking at my graph I would say that my prediction is correct because the length of a piece of wire does affect the resistance of the voltage going throw it.

### Evaluation

I would say that I could improve investigation by adding more detail on what I did and how I did it. I could also research more information on how to conduct my investigation further. I should have spent more time collecting information and results, which would have made my test fairer than it was all though I did do my test 3 times because I still don’t think that my test was fair enough.

Kassandra McDonald

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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