• 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)

    A second graph was then drawn up, between the calculated resistance and the length of wire. Strategy This experiment counted on there being 3 main variables, Voltage, Current and Length of wire, these all needed to be measured with precision.

  2. To find out what happens to the efficiency of a motor as I change ...

    My graph backs up these comments. As you can see, the weights tested that were higher than 0.6N produce a clear downwards trend, showing that the efficiency of the motor decreases as the weight of its load is increased. Explaining what I have found out The first trend - why does the efficiency increase?

  1. Physics Coursework Gravity Investigation

    Now the golf ball's properties have changed, the amount of energy the ball has at all the transformations, is different. When the golf ball is held at the release height, it will have the same amount of gravitational potential energy, as the values for height, mass and gravity remain the same.

  2. Resistance of wires

    So accurate reading from these two meters is essential. We first setup the series circuit (as shown above), not forgetting to attach a crocodile clip to each end of the gap in the circuit where the wire will be attached (where the red dots are above). The voltmeter should be connected from just before the copper wire to just

  1. 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

  2. Free essay

    Resistance. I plan to keep this a fair test. The only variable will be ...

    The resistance is from the electrons having to force past atoms, much like walking down a busy corridor and colliding with people as you walk along. When you have a shorter wire, there are less atoms and electrons, making it easier for electrons to flow free.

  1. Resistance of Wires

    to travel further, and are more likely to collide with the metal ions, thereby increasing the resistance of the circuit. The above analysis and conclusion fully support my prediction that as the length of the wire increases, the resistance of the circuit will also increase.

  2. Objective: to investigate how the rate of resistance is affected by the different thicknesses ...

    Keeping The Experiment Fair Keeping the experiment fair is very crucial in me getting accurate reliable results. The only thing I have to do to keep the experiment fair is only change the length of wire which is the variable.

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