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Physics Resistance Investigation

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Introduction

Physics Resistance Investigation

Aim

This investigation is to see how the resistance of a constantan wire changes with the length of the wire.

Key Factors

The resistance of a wire changes due to certain factors or variables. As I am investigating how resistance changes according to the length of the wire, I will keep all of these factors the same except for the length of the wire.Some of these factors are:

Length of wire  The resistance should increase as the length of the wire does.

Temperature surrounding wire ➔ I will try to keep the surrounding temperature of the wire constant otherwise resistance could increase if the temperature does. This is because heat causes the atoms to vibrate at a faster rate. As this happens, it causes more collisions between the charged particles and the fixed particles resulting in a higher resistance.

Current passed through wire ➔ This will be kept the same all the way through the experiment. It must also be kept at a safe level to avoid over heating of the wire.

Material of the wire

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Middle

1.00

0.86

70

0.98

0.83

1.18

80

1.28

0.75

1.70

90

1.31

0.69

1.89

100

1.58

0.63

2.50

My preliminary results show that my plan is correct. I will now conduct the final experiments. To make sure they are accurate, I will do three sets of tests and then find the average.  

Results

Set I

Length of constantan wire (cm)

Voltage (V)

Current (A)

Resistance (Ω)

10

0.95

3.10

0.20

20

1.31

2.10

0.62

30

1.32

1.62

0.81

40

1.50

1.61

0.93

50

1.66

1.08

1.53

60

1.74

0.94

1.85

70

1.79

0.83

2.15

80

1.82

0.74

2.45

90

1.85

0.68

2.72

100

1.88

0.62

3.03

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Conclusion

Conclusion

I believe that due to my results my prediction was correct. We can see this  by looking at the graph. As the length of the wire is increasing, so is the resistance. Also, if we look at 1 Ω on the graph, we see that it is about 30 cm and if we look at 2 Ω it is about 60 cm so I was correct that the resistance would double if the length of the wire would as it would have double the particles to collide with.

Evaluation

I think that overall my results were accurate. I found no anomalous results. The Graph shows a straight line which means my experiment was conducted correctly.

Most of the factors which were intended to remain constant were, however, I had little or no control over the temperature. Thankfully though, there were no major changes in temperature that I knew of.  

I disagree that seeking more results in my experiment would have any difference on the current results. I do not believe that if we continued with a longer wire we would have found a new pattern. This is again because the graph clearly shows the straight line indicating that it is highly unlikely that there would be any change further on.

Syed Bokhari

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