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Investigation into looking to see if the length of a wire affects its resistance.

Extracts from this document...

Introduction

Investigation into looking to see if the length of a wire affects its resistance.

In this investigation I am going to see if the length of the wire effects the resistance of the wire. Although the length effects the resistance there are other factors involved. For example, the temperature. The hotter a wire gets the harder it is for electrons to flow through. The thickness of the wire could also affect it. The thinner a wire is the harder it is for electrons to flow as there is less room.

I used the textbook “Balanced Science Two” to help with my research on resistance.

The metal wire like all metals contains some electrons, which are free to move. These are called free electrons and they move around randomly. The more free electrons a material has, the better the conductor. A conductor with a high resistance only lets a small current flow. A conductor with a low resistance allows a higher current to flow.

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Middle

7. Remember to switch off the power pack between each reading, otherwise the wire will burn.


My results

Length of Wire

(m)

2v

4v

6v

Average

Resistance

(Ω)

V (v)

I (A)

R (Ω)

V (v)

 I (A)

R(Ω)

V

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Conclusion

With the exception of one anomalous result I think that our results are quite accurate, as they are what we expected, and I think that we can use this evidence to support a firm a conclusion. We can also see that the quality of results and evidence is good.

If we were to do the investigation again more accurate results could be obtained by using more accurate equipment. While using the school equipment is was sometimes hard to write down an accurate result as the ammeter and voltmeter kept changing it’s reading. In the end we had to take the result that the ammeter or voltmeter flickered to the most. This is not an accurate way to record quality results.

We could also get more accurate results by doing more repeats. That way we could a more accurate average of the resistance and identify more anomalous results.

        Overall I think that my results are good enough to support my prediction and my conclusion.

                

...read more.

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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