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I predict that the longer the wire the more resistance because the electrons have further to travel.

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Introduction

Hypothesis I predict that the longer the wire the more resistance because the electrons have further to travel. I also think that the thicker the wire is the less resistance there will be because there will be more routes for the electrons to travel therefore reducing congestion and resistance. Plan The aim of the experiment was to see how the length and thickness of wires affects the resistance of the wires so we took the ammeter reading and voltmeter reading at 100cm and recorded it then we took the readings at 90cm and the 80cm until we got to 30cm. We did not go below 30cm because there was a risk of the wire melting due to extreme temperature. ...read more.

Middle

The results were not reliable because there are errors that I have circled on the graph. This could be down to us not waiting long enough for the wires to cool down also the points at which we took the readings might not have been exactly 10cm apart. Results At 50cm At 100cm Ratio Thick Medium Thin All the ratios would have been 2 (doubled) if the experiment was more accurate. This proves that the resistance and thickness is directly proportional to resistance, the longer the wire the more resistance and the thicker the wire the less resistance and you can see this from the graph. Conclusion I think overall the experiment went well and I got the relevant information needed to prove my hypothesis. ...read more.

Conclusion

We could have also got the class to put are results together making an even more accurate results table, the only problem with this is that different peoples equipment may have been different and therefore given different readings. I think the graph clearly shows evidence that length and thickness of the wires is directly proportional or indirectly proportional to the resistance, the length is directly proportional to the resistance because the further the electrons have to travel along the wire the more chance they have of colliding with metal ions and loosing energy which will increase the resistance. You can also see that the resistance is inversely proportional to the cross sectional area this is because the bigger the cross sectional area of the conductor, the more free electrons there are to care the electron charge along the wire therefore lowering resistance. Peter Gibson 10E ...read more.

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