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GCSE Course work: How the Length of A Piece of Wire Affects the Resistance

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Introduction

GCSE Course work: How the Length of A Piece of Wire Affects the Resistance

Planning

I plan to investigate how the length of a piece of wire affects the resistance. I will take 1metre of 22 gage wire. I will then coil the wire to keep it compact and hence safer. Next I shall place the wire into a circuit as shown below:

        I will then pass 5 volts through the wire and measure the current flowing through using an ammeter. I shall then record the results in a table. Then I will remove 10cm from the wire to leave 90cm. I will then pass 5 volts through the wire and measure the current flowing through this. I will then repeat this until I have readings of current for 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100cm of wire. This will give me a wide range of results.

...read more.

Middle

injure them. Also I have tried to use relatively thick wire. Otherwise if the wire was very thin it would become very hot, even at very low voltages.

        I have also made sure that I turn off the power pack and leave the wire for a while before I touch the wire In-case it is hot. Only then will I touch the wire to remove it from the circuit.

Prediction

I predict that the longer the piece of wire the more resistance it will have. From previous research I have found that this is because the wire has obstacles which the flow of electrons have to overcome. So the smaller the cross-section of the wire the more resistance it has because it will be much harder for the electrons to flow freely down the wire.

...read more.

Conclusion

Sources of Error

Although my results were very accurate there were some areas of error. They are the fact that:

  • I was unable to measure the length of wire as accurately as I would have liked to as the wire was very bendy and was unable to be straightened perfectly.
  • I was unable to measure accurately with a ruler.
  • I was often unable to get the voltage exactly to 5v as the reading often flickered.
  • The ammeter only measured to two decimal places.

Possible Improvements

  • Having more time to repeat the investigation to get even more accurate and reliable results.
  • Use a more accurate way of measuring current and voltage.        

...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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