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Resistance of Wire.

Extracts from this document...

Introduction

Resistance of Wire Coursework

My coursework is about the resistance of the length of a wire. Resistance occurs when the electrons travelling through the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is for the electrons to move through the wire.

Factors

Temperature: If the wire is heated up the atoms in the wire will start to vibrate because of their increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons. This increase in collisions means that there will be an increase in resistance.

Wire length: If the length of the wire is increased then

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Middle

V = I/R

This formula can be rearranged to work out the resistance. R = V/I

Method

1. Connect the crocodile clip (that is joined to the volt meter) to the wire at 10 cm and get a reading of amps and volts.

2. Repeat this for 20, 30, 40, 50, 60, 70, 80, 90 and 100cm.

3. Record the results in a table and plot them onto a graph.

Prediction

I predict that the longer the wire the higher the resistance. This is because  the electrons in the wire have to travel further.

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Conclusion

s="c4" colspan="1" rowspan="1">

50

0.96

60

1.14

70

1.23

80

1.38

90

1.52

100

1.69

Conclusion

My prediction was correct, the longer the wire the higher the resistance. This happened because when the wire was shorter the electrons had less to travel and therefore didn't take as long to give a reading of volts and amps. Also when the wire is shorter the electrons move quicker because they don't have as many atoms to push themselves through.

Evaluation

To make my experiment more accurate I could have got 3 sets of results and found an average but this would have taken too long in the classroom. I don't think I could improve the experiment because it worked very well and got me some accurate results. I also found the experiment quite easy to set up as well. A further experiment I could do would be to see whether the diameter of a wire effects the resistance.

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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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