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# To find out the effect of length on resistance.

Extracts from this document...

Introduction

CONTENTS

PLAN

• AIM PAGE 1
• PREDICTION PAGE 1
• EXPLANATION PAGE 1
• DIAGRAM PAGE 1
• EQUIPMENT PAGE 2
• MEASUREMENTS PAGE 2
• OHM’S LAW PAGE 2
• FAIR TEST PAGE 2
• CIRCUIT DIAGRAM PAGE 3
• TRAIL EXPERIMENT PAGE 3
• RESEARCH PAGE 4

OBSERVING

• SAFETY PAGE 5
• REASURANCE  PAGE 5
• RESULTS  PAGE 5

ANALYSING

• EVALUATING RESULTS PAGE 6
• AVERAGES PAGE 6
• LINE GRAPH 1  PAGE 7
• LINE GRAPH 2 PAGE 8
• LINE GRAPH 3 PAGE 9
• EVALUATING GRAPHS PAGE 11

EVALUATION

• CONCLUSIONS PAGE 11
• ANOMOLOUS RESULTS PAGE 11
• EXSTENTION EXPERIMENT  PAGE 12

AIM: To find out the effect of length on resistance.

Possible things that could affect the resistance of a wire are the material the wire is made from, voltage across it, the current flowing through it, the magnetic field close to it, the colour of the wire could determine the resistance, the width, the temperature and, finally, the length.

The one thing I am going to investigate is the length.

PREDICTION

I predict that if I increase the length of the wire then the resistance will increase.

EXPLANATION

I think this because the more material the electric current has to go through, the more resistance there will be. I can relate to this by imaging a tube with water in it: -

If the tube is tilt diagonally, the water will flow but I have to predict whether it would flow faster in a smaller tube at a set height or in a longer tube at the same height.

Middle

This will give me the readings I need. The test wire will, obviously, be the wire I test. The variable power supply will power the circuit with the switch on to make a complete circuit.

The experiment can prove my prediction because I think the resistance will increase and if I am right the results will prove this. It will do so by myself taking a measurement of the ammeter and the voltmeter with every 5 centimetres of the test wire and then, using the equation, work out the resistance and compare the results with my prediction.

I did a trial experiment and I set up the equipment as displayed for my final experiment. I did this because it will help me in my final experiment; I know exactly what equipment to get how to set it up and it will be done at a quicker rate than if I was to go straight to my final. Not only that, but it has reassured me on my measurements I decided to do (5cm-50cm with 5cm difference between each.)

These are the results for my trial experiment:

 Wire length Volts Amps(current) Resistance 5 1.00 0.75 1.33 10 1.23 0.55 2.27 15 1.40 0.39 3.85 20 1.25 0.30 4.17 25 1.35 0.25 5.40 30 1.40 0.22 6.36 35 1.40 0.18 7.78 40 1.40 0.16 8.75 45 1.40 0.15 9.33 50 1.45 0.14 10.00

In my trial experiment, it appears the voltmeter exceed 1.45 volts from the volt unit. The results and this conclusion show that there are only minor increases from 1 volt at what I originally began with and 1.45, the final result.

Conclusion

As an extension to this experiment I would see if the width of the wire affects the resistance. I would also predict that the width would affect the resistance and that the thicker the wire, the bigger the resistance. I think this because the thicker the wire means that there is more room for the current to flow and accelerate. Not only that but it lets more current in and therefore a higher resistance using the same equation:

VOLTAGE

RESISTANCE =

CURRENT

Then I would proceed with the experiment as I did in the ‘length against resistance’ experiment following the same instructions and using the same plan.

Kelly Duggan                                                          NDO physics coursework resistance 2/1/03

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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