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The aim of this experiment is to find out what factors affect the resistance of a wire in a circuit.

Extracts from this document...

Introduction

Plan

Aim:The aim of this experiment is to find out what factors affect the resistance of a wire in a circuit.

Prediction

   I predict that a longer and thinner wire will have more resistance than a short and thick wire.  This is because if the wire is longer, the current has a further distance to travel giving a higher resistance.  Also if the wire is thicker, more electrons can pass through it at any time so the current passes it quicker.

Variables

Length of wire (will be varied)

Material of wire (will not be varied)

Thickness of wire (will not be varied)

Voltage (will not be varied)

Other factors

  Apart from the variables above, there may be other factors that may affect the outcome of the experiment.  These unlike the variables cannot be controlled, these include:

   Impurities in the wire

   Bad connections

   Human faults (inaccurate readings)

   Faulty components

We cannot control these variables so we will carry out the test 3 times and find the average.

Apparatus

Copper wire

Ammeter

Voltmeter

Power pack

Wires

Crocodile clips

...read more.

Middle

0.10

0.4

0.4

0.73

0.35

0.35

50

0.09

0.4

0.4

0.75

0.39

0.38

55

0.09

0.4

0.4

0.78

0.45

0.43

60

0.08

0.4

0.4

0.89

0.48

0.47

65

0.08

0.4

0.4

0.91

0.52

0.50

70

0.08

0.4

0.4

0.90

0.55

0.55

75

0.08

0.4

0.4

0.94

0.59

0.58

80

0.08

0.4

0.4

0.95

0.63

0.62

85

0.08

0.4

0.4

0.89

0.70

0.67

90

0.08

0.4

0.4

0.95

0.75

0.71

95

0.08

0.4

0.4

0.99

0.76

0.75

100

0.08

0.4

0.4

1.02

0.79

0.77

Average Current

Average voltage

Resistance

Length of Wire

With 1st results

Without 1st results

With 1st results

Without 1st results

With 1

...read more.

Conclusion

"c19 c4">0.39

25

0.32

0.4

0.33

0.19

1.03

0.49

30

0.31

0.4

0.36

0.25

1.19

0.61

35

0.31

0.4

0.42

0.29

1.38

0.71

40

0.30

0.4

0.45

0.32

1.48

0.80

45

0.30

0.4

0.48

0.35

1.59

0.88

50

0.29

0.4

0.51

0.39

1.71

0.97

55

0.29

0.4

0.55

0.44

1.87

1.10

60

0.29

0.4

0.61

0.48

2.09

1.19

65

0.29

0.4

0.64

0.51

2.19

1.28

70

0.29

0.4

0.67

0.55

2.27

1.38

75

0.29

0.4

0.70

0.59

2.39

1.46

80

0.29

0.4

0.73

0.63

2.50

1.56

85

0.29

0.4

0.75

0.69

2.57

1.71

90

0.29

0.4

0.80

0.73

2.74

1.83

95

0.29

0.4

0.83

0.76

2.84

1.89

100

0.29

0.4

0.86

0.78

2.93

1.95

Evaluation

   As you can see from the results, the first set or results are quite different to the other two.  This may have been caused by a bad or wrong connection in the circuit that has been fixed in the repeats.  The first set of results will make a very different average than if only the repeats were calculated.  I think that I could have improved this experiment by using better and more accurate equipment, a circuit that is set out better and repeated the test more times to get a more accurate results.  Also, to get a wider range of results, I could have tested other factors of the wire for resistance like thickness of instance.

Conclusion

   In conclusion, I think that I predicted correctly, as you can see in the results, the longer the wire, the higher resistance.  I think that if I had tested for wire thickness as well, I think I would have come out with a thinner wire will have more resistance.

...read more.

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