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To Investigate the Relationship between the length of wire and resistance

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Introduction

To Investigate the Relationship between the length of wire and resistance Planning To investigate the resistance of a wire, and the variables which control it: * Thickness of the wire: for this I used the thickest wire avaible which was 24swg. * The length: I will vary the length of the wire and see the changing resistance. * The material: either constantan or copper. I will use the thickest wire avaible so it will not get so hot and unsafe. I chose to use an analogue ammeter and voltmeter because it will give me more accurate results. I will use a labpack because with this the volts will remain constant, and the current from the labpack is easier to vary; so if it gets too hot I can easily adjust it. The material I chose to use is constantan because it does not conduct electricity very well, I did not use copper because it would conduct the electricity too well. ...read more.

Middle

From all the calcuated resistances I will find the average for that length. Prediction When the wire is at its longest there will be more resistance because the electrons have a longer distance of the wire to travel through and a harder route, and when it is shortest there will be least resistance, as the electrons have less of the wire to travel through. I predict that the results will be continuous. Because R=V/I, R must be proportionate to the length, because of this I predict there will be a straight line through the graph. The results will be continuous. I know this from preliminary work, which I did. Results Table Length Voltage (V) Current (I) Resistance Average 1 2 3 1 2 3 1 2 3 20cm 30cm 40cm 50cm 60cm 70cm 80cm 90cm 100cm Analyzing The evidence I have obtained during this experiment shows me that my prediction was correct: the longer the wire, the more resistance there is. ...read more.

Conclusion

In the end it worked out that using the digital voltmeter would produce more accurate results. I continued to use an analogue ammeter to keep the results accurate. Throughout the whole experiment I kept the same voltmeter and ammeter just in case there was a slight error on either one, there would be an error on all the results and I would not have anomalies. At the beginning of the experiment I had to remove the sello-tape which was keeping the wire attached to the ruler because it was heating up very quickly and would have become dangerous. I think that the results could not be entirely accurate because the wire would have un-doubtebly heated up during the experiment, which consequently would make the atoms inside it vibrate more which would increase the resistance. Further work I could do would be to investigate the relationship between different materials and the resistance. To do this I could do the same experiment as I did before, but as well as increasing the length of the wire I would also investigate different materials. ?? ?? ?? ?? Lisa Hladnik ...read more.

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