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What characteristics of a wire affect its resistance?

Extracts from this document...

Introduction

Resistance In Wires

Aim

What characteristics of a wire affect its resistance?

Fair Testing

Independent – The length of wire

Dependant – The voltage and current to calculate the resistance using Ohms Law

Control – The temperature and the type of wire

Predictions And Theory

Temperature of the wire affect resistance of the wire. If the wire is heated the resistance of the wire increases because of the particles in the wire vibrate more vigorously and move faster and further from their rest positions. This means they are more likely to get in the way of travelling electrons and so increasing resistance.

        The length of wire also affects resistance, the longer the wire, the higher the resistance because the current has to overcome more wire. Not only is it the size of the wire that can affect resistance its also what the wire is made of. Gold,

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Middle

0

0

0.2

0

2)

Length of wire (cm)

V (V)

I (A)

R (Ω)

100

1.09

0.18

6.05

80

0.85

0.18

4.72

60

0.59

0.17

3.47

40

0.39

0.19

2.05

20

0.15

0.17

0.89

0

0.05

0.17

0.3

3)

Length of wire (cm)

V (V)

I (A)

R (Ω)

100

1.07

0.18

5.9

80

0.88

0.18

4.9

60

0.60

0.18

3.3

40

0.40

0.17

2.4

20

0.21

0.18

1.2

0

0.01

0.17

0.06

Constantan 34

1)

Length

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Conclusion

Evaluation

I think we got a relatively good set of results, which agree with my prediction and theory from the text books. However we did find one anomalous result but this did not affect the average results. To improve our investigation I think we could have used the exact same equipment each time as each may differ slightly. I think our results are accurate and that if we did the investigation again we would get approximately the same results.

I could extend my investigation by using a different type of wire not including diameter. Yhis wire could be made from a different type of metal.

Page  of

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