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Resistance in a wire

Extracts from this document...

Introduction

GCSE Physics coursework

Resistance in a wire

Plan

Aim

To investigate how the length of a wire affects its resistance.

Variables

  • Type of wire- the arrangement of the nuclei in the wire can make a collision more or less likely depending on density on the wire.
  • Temperature- when a nucleus gets hot it will vibrate therefore taking up more space and making a collision more likely.
  • Width of wire - In a wider wire there is more space between each nucleus, providing the electrons with more space so a collision is less likely reducing the resistance of the wire.
  • Length - I aim to find out whether or not the length of the wire makes a difference.

Shuldnt there be an explaination of how the wire effects the nucluses or w/e?

Theory

A current is a flow of charge. Electric current is the flow of electrons, usually in a wire. A current comes from cells or batteries, the electrons are already in the wire but have no charge.  Current is measured in Amps using an Ammeter.

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Middle

Length of wire

Voltage (volts)

Current (amps)

Resistance (R=V/I)

1st

2nd

3rd

Average

1st

2nd

3rd

Average

10cm

0.32

0.39

0.32

0.34

4.21

4.29

4.32

4.24

0.08

20cm

0.45

0.49

0.46

0.47

4.01

4.05

4.12

4.06

0.12

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Conclusion

More repeats could be taken but I don't think this would add much to the accuracy of the conclusions.

Longer lengths of wire could easily be tried, up to whatever maximum could be obtained. With a suitable location a length of several metres could be obtained. If the wire gets too long then a higher voltage might be needed in order to give good results. It would be interesting to try shorter and shorter lengths although a limit would be reached when the wire begins to heat up. It may be possible to use a lower voltage although readings for longer pieces of wire would not be so good

Extending the investigation

Suggestions have already been made to extend the range of lengths investigated and to see if the observed trend continues. There are alternative wires that can be used. Instead of using copper wire other wires could be used. It would be interesting to investigate how the structures of the different wires affect the resistance.  It would be interesting to find out what affect adding components to the circuit would make to the resistance of the wire.

Lucy Simmons

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