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RESISTANCE OF WIRE

Extracts from this document...

Introduction

SCIENCE COURSEWORK

RESISTANCE OF WIRE

INTRODUCTION

Resistance=

Resistance is affected by

• Length
• Ares(swg)
• Type of metal

All metals are conductors

A bundle of electrons will move to the positive side of the battery. This is a current measured in ampere. The positive nuclei are the obstructions which will cause a resistance.

HOW RESISTANCE IS AFFECTED BY LENGTH

Type of metal, temperature and area are the same. The resistance in a short wire would be small. The current would be high. This is because a short wire has fewer obstructions (nuclei) so that more electrons can get pass providing a large current and low resistance. The other reason is that it has a shorter distance to travel.

The resistance in a long wire will be large and the current will be less. This is because a longer wire has more obstructions. Therefore fewer electrons can get through producing a small current and a large resistance. The other reason is that it has a longer distance to travel.

HOW RESISTANCE MIGHT BE AFFECTED BY AREA

Smaller area has less current because there is less space for the electrons to pass through.

Middle

50

1.66

0.47

3.53

60

1.72

0.40

4.30

70

1.45

0.30

4.83

80

1064

0.29

5.66

90

1.81

0.28

6.46

100

1.94

0.27

7.19

 LENGTH(cm) VOLTAGE(V) CURRENT(A) RESISTANCE(    ) 10 0.54 0.72 0.75 20 0.82 0.55 1.49 30 0.98 0.49 2.00 40 1.53 0.54 2.83 50 1.63 0.46 3.54 60 1.72 0.41 4.20 70 1.79 0.36 4.97 80 1.86 0.33 5.34 90 1.81 0.28 6.47 100 1.83 0.26 7.04

AVERAGES

 LENGTH(cm) 1st

Conclusion

The average readings varied a lot from the predicted results:

 5 m wire 8 m wire Predicted 1.91 3.54 Practical 3.05 5.50

The average readings doubled from the predicted results. The readings are higher than what it should have been. This could have been because the voltmeter and ammeter was flickering all the time or the length of the wire might have been measured wrong. It might have also been that the wire was getting hot and the readings got higher. Crooked wire and the thickness of the crocodile clips would also change the results introducing an error. During the experiment I made a mistake and put the voltage on the power pack at 3 which was too low when it should have been at 6.This made my results unreliable and the readings were negative. To improve it I did the experiment once again. Next time, I would make sure the wire is more straight and to use pins instead of crocodile clips to confirm my prediction and prove my hypothesis.

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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