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Resistance of a Wire

Extracts from this document...

Introduction

Will changing the length and type of wire affect the resistance?

What is my aim of this project: To set up an electric circuit to measure the resistance of the wire.

What are my Variables:

  • Thickness of the wire
  • Length of the wire
  • Type of wire

Equipment I plan to use:

  • Wires
  • Volt meter
  • Ammeter
  • Crocodile clips
  • Power pack
  • Ruler
  • Copper coil
  • Nichrome coil

What is resistance?

Resistance is measured in (OHMS). It is the hindrance to the flow of charge.

Why did we get resistance?image19.png

An electric current flows when electrons move through a conductor. The electrons that are moving can collide with the atoms of the conductor. This then means that it is more difficult for the current to flow, which causes resistance.

On the other hand, electrons have a collision with atoms more often in a longer wire than they do in a short one, however, a thin wire has fewer electrons to carry the current than a thick wire. In a thin wire there is less space, but more resistance and in a long wire there is more space, yet less resistance.

...read more.

Middle

20cm

Ammeter

0.4

0.4

0.38

0.37

0.38

4.87

Voltage

0.62

0.62

0.62

0.61

1.85

30cm

Ammeter

0.22

0.22

0.23

0.23

0.68

2.1

Voltage

0.66

0.66

0.67

0.67

2

40cm

Ammeter

0.2

0.2

0.2

0.2

0.2

3.4

Voltage

0.68

0.68

0.67

0.69

0.68

50cm

Ammeter

0.16

0.16

0.15

0.15

0.15

4.87

Voltage

0.75

0.75

0.72

0.72

0.73

image20.pngimage15.pngimage14.png

The graph shows that the data is positive. From observing this graph above I can see that my data is close fitted along my line of best fit and that the data increases a lot, showing that this is a . as well as this there is s apiece of anomaly data, which is my outlier, circled in black.

For my experiment, I will be taking account the differences in resistance between the different lengths of Nichrome wires. This will be tested against copper which, has a low resistance and high current and is thinner than the Nichrome wire that has high resistance and low current.

Method

In order for me to complete my investigation, I will need to gather the equipment listed above and set up my electric circuit. This will be done by the use of connecting my wires to the volt meter and ammeter and then attaching crocodile clips on each ends of the wires.

...read more.

Conclusion

Evaluation:

I think my investigation worked well against my method and my hypothesis. I was able to complete my aim of this investigation, which enabled me to take down my readings of the current and voltage easily. I found the circuit easy to manipulate with no obstructions, which enabled me to record my results accurately for the resistance of the different lengths of wires.

If I had the chance to re-do this project, I would have used a smaller current, because then I wouldn’t affect the wires temperature in heating. This would then mean that it wouldn’t affect the resistance of the wire being tested. As well as this I would use longer measurements of wire instead of just testing up to 50cm and test more different types of wires.

Lastly, I feel that my experiment went well, which achieved its aim.

...read more.

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Here's what a star student thought of this essay

4 star(s)

Response to the question

The writer has been able to approach this question very clearly and as a result has been able to answer the question that they were set. They were able to explain the physics behind the experiment very briefly and show ...

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Response to the question

The writer has been able to approach this question very clearly and as a result has been able to answer the question that they were set. They were able to explain the physics behind the experiment very briefly and show very clearly how they were going to look at the resistance of a wire. It was good that they did a preliminary experiment as they were able to see the pros and cons of their main experiment and therefore able to amend any problems. They mentioned that their data from the preliminary experiment fitted the line of best fit, however they didn't use their own graph key and show where the anomalies were. It was good that they explained why the wire they chose was the best one.

Their main experiment was carried out well. When they are writing data, they should use the same able to significant figures or decimal places throughout. They mention that they have a graph for their main experiment however, this cannot be seen. Although they explained this graph and the data, they should have had a few lines for a conclusion. The evaluation was of a good standard.

Level of analysis

The language that the writer used was of a high standard. They were able to explain the idea of resistance. However, they should have explained what Ohms law is and why it is applicable to the experiment that they are doing. As mentioned before, what the writer should make sure in the future is that significant figures/decimal places are constant throughout.

Quality of writing

Spelling and grammar are of a high standard. However, one thing that should be mentioned is to make sure that all data is clearly presented and grouped on only one page and try not to span it over more pages. Another thing that the writer should also look into doing page numbers.


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Reviewed by cpdavis 29/02/2012

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