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In this investigation I am trying to find out whether adjusting the length of a wire affects its resistance.

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Introduction

Chris Mawson        Science Coursework        -  -

Science Coursework

Plan

In this investigation I am trying to find out whether adjusting the length of a wire affects its resistance.

I predict that as I increase the length of the wire the resistance of the wire will increase proportionately. For example if I were to increase the length of the wire by the same amount each time I would expect the resistance to increase by the same amount also. I believe this will happen due to the how the electrons, which make up the current, act inside the wire. When the wire is made longer, the chance of collision for the electrons is greater. This is because there are more obstacles for them to pass through. The increased amount of collisions causes kinetic and heat energy. The kinetic energy is let off vibrations in the wire while the heat energy makes the wire increase in heat.

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Middle

50cm

2.2

2.3

2.2

2.23

60cm

2.5

2.5

2.6

2.53

70cm

2.7

2.7

2.8

2.73

80cm

3

2.9

3

2.96

90cm

3.3

3.2

3.4

3.3

100cm

3.6

3.5

3.7

3.6

Ohms Law

Length of wire

Volts

Current

Ohms

10cm

1

1

1

20cm

1.2

0.9

1.35

30cm

1.3

0.8

1.63

40cm

1.4

0.7

2

50cm

1.4

0.6

2.3

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Conclusion

Evaluation

I believe that the inaccuracy of some of my results was due to a mixture of human error and poor equipment conditions. The wire was consistent enough to maintain an equal amount of resistance for every 10cm of length added. However the incorrect results I think were due to possible added resistance from elsewhere, for example the crocodile clips or the multi meter itself. If I were to do the experiment again I would first set up a pre experiment test, using the same equipment and to see if the positioning of the crocodile clips has any effect on the results. I would expect the optimal place would be on the outside of the lengths. I would also make sure that my measurements are all accurate and precise so that I can hold no blame and the only problem would be the equipment.

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