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My investigation will aim to show how the resistance of a wire is altered with the length of the wire.

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Introduction

Physics Investigation; Testing Resistances Jack Burnham 10C (2001) Planning; The Investigation: My investigation will aim to show how the resistance of a wire is altered with the length of the wire. Equipment List: For the experiment I will need; An Multi-meter / Ohmmeter, A large amount of "Constantan wire", Normal Wire, 2 Crocodile clips, Some Cardboard, A Ruler, A Wire-cutter. Prediction: I think that the length of the wire will affect the resistance. My prediction is that the longer the wire, the higher the resistance, this is also what Encarta online encyclopaedia thinks. ...read more.

Middle

Then I will affix one crocodile clip to the start of the wire, and secure it in place. Then I will have one more crocodile clip, but move it to different measurements, to test the resistance if the wire. I will record my results and analyse them. How I will make it a fair test: I will ensure a fair test by making sure firstly that the wire is very taught, and that there is no tension in it, thus making the measurements exactly correct. ...read more.

Conclusion

I think that doing this many results will ensure that I get correct, and accurate results. Diagram of Apparatus: Analysis; Results: I checked that my results were accurate by repeating them three times. My results were as follows: Wire Length Result 1 Result 2 Result 3 FINAL RESULT 20cms 1.9 1.9 1.8 1.9 40cms 4.4 3.8 3.6 60cms 5.7 5.7 5.5 80cms 7.4 7.3 7.2 100cms 9.3 9.1 9.4 120cms 11.0 11.0 11.0 140cms 12.9 12.6 12.6 160cms 14.6 14.3 14.4 180cms 16.9 16.1 16.1 200cms 18.0 17.7 18.0 I took the mean of the three results to give me the one final result. ...read more.

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