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Resistance Investigation-Factors affecting the resistance of a wire

Extracts from this document...

Introduction

Resistance Investigation-Factors affecting

the resistance of a wire

Prediction

I predict that the longer the wire is, the more the resistance with increase.

Planning

The factors that affect resistance are:

  • Temperature of resistance wire
  • Length of resistance wire
  • Thickness of resistance wire
  • Type of material of resistance wire

If the length of the wire is changed this could affect the affects of resistance. For example, if the wire was made longer, more atoms are in the way of the electrons so there are more collisions increasing the resistance.

If the thickness of the wire is increased, more pathways are available for the electrons to take so they can avoid collisions with the atoms. This also results in the resistance decreasing.

If the material of the wire is different, it changes the arrangement of the atoms, which also changes the amount of collisions between atoms.

If the temperature of the resistance wire is too high, collisions will be high as both the electrons and atoms will be moving faster because of the increasing heat. This will increase the resistance.image00.png

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Middle

I left a 15cm gap between each measurement to make sure I will get the most reliable results that I can. This wide gap also prevents heating of the wire as if the measurements were close together only a certain part of the wire would get heated resulting in the wire increasing in temperature quickly.

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Conclusion

My graph supports my prediction by going straight through 0, which tells us the Resistance is proportional to Length and proves that my prediction is right.

Evaluation

The method I used to carry out the investigation was a good one as I achieved good and reliable results. My results showed me clearly that Resistance is proportional to Length.

There were no anomalous results, this shows that my graph and results are very accurate as every result goes straight through the line of best fit and when the experiment was repeated, my results were very close or the same to each other.

The reason for my accurate results is because I kept the temperature under control. I did this by choosing an appropriate voltage so the wire would not get too hot and also leaving the wire to cool for a few seconds before I got my next result.

To extend this experiment, I could have made more measurements to see if they took the same path as the others.

Nina Ryner

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