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

This is an investigation to find out how the length of a wire affects a piece of wires resistance. I wanted to investigate this variable as I felt I could achieve accurate results that will help me find a conclusion to my problem

Extracts from this document...

Introduction

Finding out the resistance of a wire courseworkJuly 2006

Charlotte Green 4109.

This is an investigation to find out how the length of a wire affects a piece of wires resistance. I wanted to investigate this variable as I felt I could achieve accurate results that will help me find a conclusion to my problem.

I will make this experiment a fair test by changing only one variable, this will be the length of the wire. I will keep the rest of the factors the same. E.g.; temperature, of the wire, I will keep this the same throughout as I do not wish for it to affect the experiment. I will also keep the equipment the same throughout the experiment as using different equipment may affect the results obtained.

I will also keep the type of wire the same and just change the length, this is because different types of wire may hold different resistances and are of different thicknesses which will change the resistance results.

I will range my measurements from 10cm to 1meter. I will test each length of wires resistance 3 times to make it a fair test. I will record my results and place them in a table.

Therefore I will vary the length of the wire but will keep the current the same throughout the experiment to show consistency.

My table of results will show length of the wire, amp results and voltage results.

...read more.

Middle

6.75

6.75

6.76

6.75

13.5

0.5

60cm

5.67

5.85

5.8

5.77

23.28

0.5

50cm

4.94

4.81

4.85

4.86

22.72

0.5

40cm

3.85

3.89

3.85

3.86

18

0.5

30cm

2.86

2.95

2.88

2.89

13.54

0.5

20cm

1.9

1.95

1.98

1.94

9.02

0.5

10cm

0.97

0.99

0.95

0.97

4.56

A Scatter graph to show the results obtained from the preliminary experiment.image00.png

My preliminary results show a negative correlation, the points do not fit my line of best fit, there is a slight pattern but there are a few random results that do not fit the line. Also this graph shows that the longer the wire the less resistance but I do not believe this so I am going to repeat the experiment.

...read more.

Conclusion

Looking at my results I can prove my prediction was correct, the shortest length of wire (10 cm) contains the lowest resistance while the longest length wire (1 meter) shows the most resistance.

This is because as the length of the wire increases, the amount of metal atoms that are inside the wire- for the electrons to pass through to reach the end increases so the electrons will be slowed down, making the journey longer.

The electrons have further to travel in a longer piece of wire so it is harder to reach the other end, therefore more collisions occur which increases the resistance. In a shorter piece of wire there are fewer atoms, making the path for the electrons easier, not making as many collisions, therefore there is less resistance.

This diagram shows a longer piece of wire, containing lots of atoms, and a shorter piece of wire which contains a fewer amount of atoms compared to the longer piece.

Overall I have found this experiment a success, I have collected all my results I needed with ease and it was quite an enjoyable experiment. I am glad my prediction was proved correct and I obtained accurate results. If I could repeat this investigation I would have defiantly kept the variables the same but maybe included an ohm or extended the length of the wire idea.

...read more.

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

  1. Peer reviewed

    Investigation in resistance in wires

    5 star(s)

    also we increased the wire lengths which have a larger maximum current value. Width of the Nichrome wire - due to the problem of heat and the weights there was a chance that it would stretch the wire, we made sure that this didn't happen by only using the minimum

  2. Investigate how the length of a wire affects the wires resistance.

    * To see if the results are accurate, the resistance will then be calculated from the equation 'R = V / I'. * Readings will be taken with 100cm to 10cm wire pieces with 10cm intervals for a wide selection of wires to see patterns.

  1. Resistance of a Wire Investigation

    To alter the light intensity, I placed a lamp at various distances from the plant. I also therefore needed a way of accurately measuring the light intensity, and I did this using a photometer.

  2. Resistance and Wires

    Length (cm) Test 1 Test 2 Test 3 Mean Test 1 Test 2 Test 3 Mean 10 1.00 0.97 0.93 0.97 1.8 1.7 1.7 1.7 20 1.88 1.82 1.79 1.83 3.4 3.3 3.2 3.3 30 2.77 2.68 2.60 2.68 4.9 4.8 4.6 4.8 40 3.65 3.51 3.48 3.55 6.5

  1. Investigating how the length of a Wire affects its resistance.

    Material of wire Nominal Resistance (in Ohms at 1m at 20�C) with a diameter of .9mm Copper 0.027 Constantan 0.117 Nichrome 1.63 -Obtained from the Standard wire gauge (SWG) sheet handed out in class From this experiment, we know that Nichrome has the highest resistance by far and will be

  2. To see how the length of a wire affects its resistance. To find the ...

    The wood will not conduct electricity to avoid interference in the results, making it a suitable material to base the wire on. * The reason we will be using the wire with the most resistance is because it less likely to overheat because it will not let the electrons through as quickly.

  1. Investigate one or more factors affecting the resistance of metal wires

    current to that of the nichrome wire of diameter 0.28mm, I noticed that the wire got hot. This would mean that the resistance would have changed (it would have increased). This determined that this method would not work since it would be an unfair test.

  2. Resistance of wires

    These obstacles slow down current and cut the flow of electrons, slightly. Therefore we can say that the resistance of a wire is proportional to the temperature of it. Temperature not only affects the resistance of a wire, but is also like an indicator, as the wire heats up when the resistance is high.

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