• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

Extracts from this document...

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.

...read more.

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

...read more.

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.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. Thermistor Coursework

    This is because there is more to go wrong in a circuit containing an amplifier, than one without. Resistance Temperature Detectors (RTDs) are usually wire wound components, but can be made from a thin film as well. They work on the principal that when wire becomes hotter, its resistance increases.

  2. Investigating how temperature affects the resistance in a wire

    I can conclude this as although the results do not show any immediate patterns, both the linear and the logarithmic treadlines have a negative gradient (are sloping downwards). This means that I can classify the results as having a very weak negative correlation, according to these results, the higher the

  1. Investigating the effect of 'length' on the resistance of a wire

    I used a micrometer, which has an accuracy of up to 2 d.p, to measure the diameter of the wire which was 0.11mm. The batteries I used were slightly weak as I decided measured their voltage by connecting the batteries to the voltmeter in a circuit and the reading gave me 2.90V.

  2. physics sensor coursework

    At 50 lux: VA = VB + p.d. VA = 1.64 + 3.11 VA = 4.75 V R1 = (V1 R2)/ (V-V1) R1 = (4.75 � 1500)/ (10 - 4.75) R1 = 1357.14 ? At 60 lux: VA = VB + p.d. VA = 1.64 + 2.75 VA = 4.39 V R1 = (V1 R2)/ (V-V1)

  1. Light and matter notes

    The particle like properties of EM waves are most apparent for gamma rays because the wavelength of gamma rays is very short and each gamma ray has a large amount of energy so the arrival of one is a sizeable event.

  2. Light notes

    Light starting from a point outside the focus converges to a point after reflection. An object outside the focus has a real image because light passes through the place where the image is formed. 2. Real images formed by a single concave mirror are always inverted - back to front and upside down and formed infront of the mirror.

  1. How different factors affect the resistance of a wire

    and the higher the number, the thinner the wire. The only available widths of wires were SWG 32, 30 and 26. A range of three is not sufficient enough to provide the evidence I would need to form a conclusion on the predictions. Therefore, my aim for this investigation is to investigate how the length of a piece of wire in a circuit affects the resistance.

  2. Find The Internal Resistance Of A Power Supply

    the wires of the circuit, but this could increase if the power supply was switched on continuously for a long period of time. Measurements and Readings That Will Be Taken: I will measure the length of the metal rail and split the length into eight different sections.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work