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Factos Which Affect The Resistance Of A Wire

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Introduction

Physics Coursework – Factors Which Affect The Resistance Of A Wire

Aim:

To investigate which factors affect the resistance of a wire. I am going to run a series of tests to investigate whether the length of the wire affects the resistance.

Hypothesis:

The length of the wire will make a difference. I predict that as the length of the wire increases, the resistance of the wire will also increase. This is because as the wire gets longer, more and more electrons have to travel down to the positive end and they have longer to travel. This results in a greater possibility of an electron colliding with an atom, causing resistance.

To make this test fair, the diameter of the wire will remain the same in each test.

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Middle

0.3

20cm

0.8

1.55

0.5

30cm

1.0

1.18

0.9

40cm

1.0

0.94

1.1

50cm

1.0

0.79

1.3

60cm

1.1

0.68

1.6

70cm

1.1

0.59

1.9

80cm

1.2

0.52

2.3

90cm

1.2

0.48

2.5

1m

1.2

0.43

2.8

From looking at these preliminary experiment test results, I can determine that I have set up my apparatus correctly and that there are no outliers or unusual results.

Main experiment test results:

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Conclusion

Evaluation:

These results are not completely accurate as I was only using a ruler to measure the length of the wire, so the measurements may have varied. In addition, the voltmeter could only read to one decimal place, so the results are not as precise as they could be.

However, after looking at my main experiment test results, I can conclude that they are quite reliable as they are very similar to my preliminary experiment test results. Also, I didn’t find any outliers.

If I had to redo this experiment, I would use a more effective way of measuring the length of the wire. Attaching the wire to a ruler does not seem to me to be the most efficient way of conducting the experiment. Furthermore, I would use a smaller-scale voltmeter so that my readings would be more specific.

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This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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