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Factors affecting the resistance of a wire

Extracts from this document...

Introduction

Christiana Hahn

Factors affecting the resistance of a wire

Aim

To find out if the length of the wire affects the resistance in it.

Hypothesis

I predict that the longer the wire is, the more resistance there will be. I think this, because in a longer wire, there are more chances of the atoms meeting than in a shorter piece of wire.

Plan

I will be investigating the amount of resistance in a constantan wire of the size 36. All the factors (type of wire) will stay the same; only the length will change. I will increase by 10.

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Middle

15.4

90.0

17.0

100.0

19.0

Equipment

  • Multimetre (ohm metre)
  • 2 wires that can be attached to the multimetre
  • Size 36 wire of constantan
  • 2 crocodile clips
  • 1m ruler

Diagram

Method

I laid out the constantan wire across a 1m ruler and made sure there were no kinks in it. Then I got a multimetre and set it to 200 measuring ohms (Ώ). After this I collected a red and a black wire, and attached a crocodile clip to the end of each of the wires. I plugged them on the multimetre, clipped the black wire onto the beginning of

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Conclusion

class="c3">40.0

7.5

6.2

10.6

50.0

9.3

8.2

13.4

60.0

11.9

10.0

16.9

70.0

14.0

11.6

19.8

80.0

15.4

13.7

22.3

90.0

17.0

15.3

24.7

100.0

19.0

16.6

27.3

image00.png

Conclusion

With these results I came to the conclusion that my hypothesis is correct. The resistance of the wire is proportional to its length: the longer the wire is, the more resistance there is. My graph shows this very clearly with a positive correlation which is what I expected.

...read more.

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