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# find the factors which may affect the resistance of a piece of wire

Extracts from this document...

Introduction

Amish Hirani 10N

GCSE Science Investigation

Aim:

The aim of the investigation was to find the factors, which may affect the resistance of a piece of wire.

Prediction:

I predict that the longer the wire, the higher the resistance. I also predict that as the length of the wire doubles so will the resistance and doubling the cross-sectional area would decrease the resistance by a factor of two. This is because the resistance under constant temperature conditions is directly proportional to the length of wire and inversely proportional to the cross-sectional area.

Resistance = Resistivity of Wire x Length of Wire / Cross-Sectional Area of Wire

The type of metal, the wire is made up of could also affect the resistance because different metals have their own quantity of resistivity. Finally the temperature conditions affect the resistance because the temperature causes the conduction electrons moving through the wire to collide with the electrons in the atoms more frequently. This converts some of the electrical energy to heat, which causes the resistance to increase.

Hypothesis:

I think that as the length of wire increases so will the resistance.

I think this because the resistance under constant temperature conditions is directly proportional to the length of wire and inversely proportional to the cross-sectional area.

Plan:

In this experiment we will be varying the length of the wire.

Middle

Length of wire (cm)

Current

(Amps/A)

Voltage

(Volts/V)

Resistance

(Ohms/Ω)

10

1.48

2.33

1.57

15

1.40

2.44

1.74

20

1.03

2.45

2.38

25

0.76

2.54

3.34

30

0.60

2.60

4.33

35

0.55

2.63

4.78

40

0.49

2.65

5.41

45

0.39

2.67

6.85

50

0.35

2.67

7.63

55

0.32

2.69

8.41

60

0.29

2.69

9.28

65

0.27

2.70

10.00

70

0.26

2.71

10.42

75

0.24

2.74

11.42

80

0.22

2.74

12.45

85

0.21

2.76

13.14

90

0.20

2.77

13.85

95

0.19

2.78

14.63

100

0.18

2.80

15.56

 Length of wire (cm) Current(Amps/A)

Conclusion

We might have made it inaccurate by using a wire, which was not visibly straight; this may have caused error in measuring the wire perfectly. The wire had cello tape attached to it to keep it stuck to the ruler so we could measure the length of the wire more easily. This might have made it inaccurate as the cello could have an affect on the circuit, as it is part of it.

My points were very close to the line of best fit. This indicates that our results were reliable and that we did not have any anomalous results. Our experiment was accurate and our results had a very strong correlation. My points were practically along the straight line signifying we did not make mistakes during taking results and it was a fair test.

The diameter of the wire was measured by an engineering piece of equipment. This was tightened around the wire and then when we couldn’t tighten it any more, we read the measurement. It gave us the measurement of 32mm.

We realised that when length of wire = 0 there was still resistance. This is because the connecting wires are the wires causing the resistance. In any circuit there will always be resistance.

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

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