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Physics Coursework - Factors that affect the resistance of brine-soaked paper

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Introduction

Physics Coursework – Factors that affect the resistance of brine-soaked paper

AIM

I am trying to find out how different factors affect the resistance of brine-soaked paper. I will choose one factor and then do a series of experiments to try to find out how this factor affects the resistance. I have chosen to change the length of the paper.

PREDICTION

I think that when I increase the length of the paper, the resistance will also increase. When I increase the length, I predict that the resistance will also increase by the same amount making the relationship directly proportional.

This is what I think the graph of final results will look like:

image00.png

I think this will happen because the resistance will drop when the length of the paper is reduced. This is because the ions have a shorter distance to travel through the liquid on the paper when it is a short piece of brine-soaked paper and therefore have less time and less in the paper to collide with the anything.

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Middle

RESULTS 2

Length of Paper (cm)

Voltage (V)

Current (mA)

Resistance

(kimage01.png)

1

1

5.02

7.40

0.68

2

5.02

3.92

1.28

3

5.02

3.25

1.54

4

5.01

2.64

1.90

2

1

5.02

7.33

0.68

2

5.01

3.87

1.29

3

5.01

2.71

1.85

4

5.02

2.25

2.23

3

1

5.01

7.37

0.68

2

5.02

4.13

1.22

3

5.02

3.43

1.46

4

5.00

2.40

2.08

Average!

1

5.02

5.66

0.68

2

5.02

4.06

1.26

3

5.02

3.13

1.62

4

5.01

2.43

2.07

CONCLUSION 2

From these other sets of results I can now see that the same thing is happening again and now I will pull all the results together and put them into a results table then make a graph showing all the results on one graph and see whether

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Conclusion

We did not have any odd results. A few of them were spread apart slightly for example 3cm the highest and lowest had a difference of 0.72mA but the resistance worked them out to be more similar and the average was not strayed away from the line of best fit.

I am more certain that my conclusions are correct because we made sure that our experiments were fair each time and I looked and analysed my results and graphs before making my conclusions. Any experiment that I thought needed to be re-done or added. I did which makes me more certain that my conclusions are right.

To find out more about this investigation, I would do a lot more experiments using longer lengths too and I would do experiments for all the different factors I could have chosen for the concentration, width of paper and voltage.  

...read more.

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