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Resistance Of A Wire – What Affect Does Length Of Wire Have?

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Introduction

Resistance Of A Wire - What Affect Does Length Of Wire Have? Introduction: We need to find out what effect the length of a wire has on the resistance of the wire. Important factors: Temperature of wire, length of wire, type of wire, thickness of wire and voltage across wire, are all important factors to consider. Factors to investigate: I am going to keep the type of wire, thickness of wire, temperature of wire and voltage across wire the same. But I am going to change the length of wire each time. Prediction: I think that the shorter the is the lower the resistance will be, because the further the wire has to travel the more current is being used up this will effect the resistance of the wire making it hire over a long piece of wire than it is over a short piece of wire. ...read more.

Middle

a circuit with the wire (as shown in the diagram), next I will put an ammeter and a voltmeter into the circuit, the ammeter will be in series and the voltmeter in parallel (as shown in the diagram). Next I will turn on the power pack I will take reading from both the ammeter and the voltmeter, I will record my results in a table. I will repeat this process using different length of wire, I will, do each length twice, just to check that my results are accurate. Results: Test 1 Voltage (v) Current (amps) Resistance (ohms) Length of wire (cm) 1 4.5 0.22 20 1.2 4 0.30 30 1.2 3.6 0.33 40 1.2 3.5 0.34 50 1.4 3.2 0.44 60 1.2 3 0.40 70 1.6 2.9 0.55 80 1.8 2.6 0.69 90 1.9 2.1 0.90 100 Test 2 Voltage (v) ...read more.

Conclusion

Analysis of graphs: I don't think that my graph is very accurate because there are 3 anomalous results that are no very close to my line of best fit. (These results are highlighted in yellow on my hand drawn graph). But the graph does prove that the longer the wire the higher the resistance is. Conclusion: I have found out that the longer the wire the higher the resistance. You can see this in the graph because the resistance goes up almost in a straight-line apart form a few results. I think my results are fairly accurate over all. Evaluation: I think that the experiment went quite well although the results were not completely accurate. I the experiment would have been better and more accurate if we were able to regulate the temperature of the wire. ...read more.

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