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# Resistance of a Wire Experiment

Extracts from this document...

Introduction

Physics GCSE Coursework:

Resistance of a Wire

Experiment

Introduction:        I will be investigating the effect that changing the thickness of a piece of wire has on its resistance.

Prediction:        I anticipate that the thinner the wire is, the more the resistance will increase against the current flow. This occurs because as the cross-sectional area decreases, the harder it becomes for the electrons to fit through a smaller area. When water flows down a pipe, it has the formula Resistance = Pressure difference. If the area of

Mass of Water/sec

the pipe doubles, it will allow more water to flow through the pipe creating less resistance. The same principle applies when talking about the electrons through a wire. Therefore I think that the thicker the wire the lower the  resistance.

Resistance is defined as R=V/I.

Middle

Current A

24

0.92

0.44

24

0.95

0.48

24

0.92

0.44

 S.W.G Voltage V Current A 26 1.11 0.35 26 1.05 0.33 26 1.02 0.32
 S.W.G Voltage V Current A 28 1.26 0.26 28 1.24 0.25 28 1.24 0.26
 S.W.G Voltage V Current A 34 1.57 0.12 34 1.56 0.12 34 1.56 0.12

Conclusion

I saw this steady increase of resistance against the steady decline of the area, both making a straight diagonal line of best fit. This graph supports my prediction.

Evaluation: I think that we carried out this experiment in the best possible way we could due to lack of resources and time. Still we could have done these things below to make the results more accurate.

1. I could use a wider variation of wire lengths.
2. I could use a wider variation of wire areas.
3. I could have made the currents all the same.
4. I could have investigated using different materials for the wire.

By Robert O'Sullivan

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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