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Copper Wire- Physics Investigation

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Introduction

Aim: In this investigation I will be investigating resistances of different lengths of wire ranging from 40cm-90cm of 24 SWG wire at a power supply voltage of 1.5V, using a range of apparatus. Apparatus: 1. 90cm of 24 SWG wire 2. Voltmeter 3. Ammeter 4. Power supply 5. Meter ruler 6. Variable resistor 7. Crocodile clips Method: The way in which I am going to carry this experiment out is: first I will gather everything in my apparatus list (see above), measure out 90cm of wire using the meter ruler and then I will set everything up as shown in the diagram below. Method (continued): Then, I do a preliminary experiment to establish a range for the different lengths of wire that I will use. ...read more.

Middle

Then I worked out an average resistance, a range and a half range. After filling out the table I drew a graph and worked out an equation. Length(cm) V� I� R� V� I� R� V� I� R� 40 0.06 0.09 0.66 0.06 0.09 0.66 0.06 0.09 0.66 50 0.08 0.09 0.88 0.08 0.09 0.88 0.08 0.09 0.88 60 0.10 0.09 1.11 0.10 0.09 1.11 0.10 0.09 1.11 70 0.12 0.09 1.33 0.12 0.09 1.33 0.12 0.09 1.33 80 0.13 0.08 1.62 0.13 0.08 1.62 0.13 0.09 1.44 90 0.15 0.08 1.87 0.15 0.08 1.87 0.15 0.08 1.87 Results: Ave.Resistance Range 1/2Range 0.66 0 0 0.88 0 0 1.11 0 0 1.33 0 0 1.56 0.18 0.09 1.87 0 0 Conclusion: In conclusion, I have found that as the length of the wire increases, the voltage also increases however the amps decrease. ...read more.

Conclusion

In my experiment all but one of the lengths that I did contained no error bars, and the one that did, had a very small error bar. This could imply that my results were accurate, so I am convinced that my conclusion is accurate. The last two points did not go on the line of best fit however all of the others did. To make my results even more accurate I could get more high quality equipment, for example, the voltmeter and ammeter that I used only gave readings to two decimal points, so I could get voltmeters and ammeters that give results to more decimal points. Furthermore, I could repeat this experiment with a new set of apparatus (except for the wire) each time to make sure that there wasn't any faulty equipment. ?? ?? ?? ?? ...read more.

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