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An investigation into the conductivity of graphite paper

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Introduction

GCSE Physics Coursework 2003

An investigation into the conductivity of graphite paper

Max Bibby 11J

Dulwich College

Aim

The aim of this experiment is to find out how much the length of graphite paper affects the amount of electricity conducted in a circuit. I will perform a series of experiments to draw a conclusion.

Method

For this experiment I will be varying one factor. This factor may affect how well the graphite paper conducts electricity. The factor I have chosen is the change of length of the graphite paper.

To ensure that my test is accurate I will have to make it a ‘fair’ test. For example I will use the same piece of graphite paper throughout the experiment, as some of the graphite paper may be different in thickness and width. I will also use the same ammeter, power supply and converted bull dog clips because they may be slightly different and if they are changed the results will vary compared to other results obtained by different apparatus.

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Middle

27

0.94

30

0.81

image01.png

As you can see from my graph and my table of results as the graphite paper becomes longer in length the current becomes weaker and therefore less. There is a very sharp drop to begin with and that is because of the amount of resistance increasing due to the increasing length of the graphite paper.

There is obviously a clear trend that as the length of graphite paper increases the current decreases and gradually works its way down to zero.

Current    

Resistance

9.425

1.27

4.55

2.64

2.85

4.21

2.05

5.85

1.63

7.36

1.4

8.57

1.25

9.6

1.01

11.88

0.94

12.77

0.81

14.8

image02.png

As you can see from this graph and table of results as resistance increases, current deceases. This is because as the amount of resistance increases more electrons are prevented from moving and therefore the passing of current through the graphite

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Conclusion

Evaluation

The procedure used for my investigation worked well as it obtained accurate and valid results, which were needed.

 My results were very accurate and there were no anomalies the points did not precisely align but I will put that down to human error.

Throughout my investigation everything ran smoothly. The only part of my procedure that I would change would be the measuring and cutting of the graphite paper I would find a way to make it more accurate. But that was it everything else worked very well and ran smoothly.

I believe my results are very reliable and support my conclusion there were no anomalies and it is extremely unlikely that all of my results are anomalies.

To provide additional relevant evidence in my investigation I would make more readings and measurements to hopefully allow for more accurate results. I would also make all my measurements of the graphite paper more accurate and use a more precise ammeter. All of the additional improvements may allow for more accurate results and therefore a more accurate and precise investigation.

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