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Resistance of a wire - PHYSICS COURSEWORK GCSE

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Introduction

PHYSICS COURSEWORK - RESISTANCE

PLAN

What affects the resistance of a piece of wire?

There are many variables in this investigation. The resistance of the wire could depend on:

  1. The voltage from the power pack
  1. The voltmeter
  1. The ammeter
  1. The length of the wire
  1. The piece of wire used i.e. the material it is made from        
  1. The temperature of the wire
  1. The diameter of the wire

I shall investigate how the length of a wire affects its resistance.  

In this investigation:

My independent variable is the resistance of the wire

My dependant variable is the length of the wire.

To make it a fair test the variables I hope to control are: the piece of wire, the potential difference, the power pack, the ammeter, the voltmeter and the temperature.  Where possible I will record the values of these variables throughout this investigation to show that I have tried to control them.

Hypothesis:

I expect that the resistance will almost inevitably vary with length. I also predict that the longer the wire the more resistance it will show.

Resistance is the force that opposes the flow of an electric current round a circuit so energy is needed to ‘push’ the charged particles round the circuit. The larger the resistance the more force you have to apply and the more energy you need to use to produce a current.

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Middle

In the interests of safety I will endeavour not only to keep the power pack at a constant value but also at or below of 2V as at any higher the wire could become unsafe and burn through the wire. Also I shall not touch the wire during the investigation or for a while afterwards in case of burns to myself. I will keep my hair tied back and ensure all

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Conclusion

If I were to redo this investigation my new circuit would look like this: (with a rheostat added)

If I were to go on with this experiment and expand it, I would find it interesting to look at how the width of the wire and material the wire is made from affects its resistance. If I had more time I would also carry out more repeat readings to make my results as accurate as possible.

Overall I think this investigation was successful and done to the best of my ability using the equipment provided. It proved that changing the length of a wire does indeed affect the resistance flowing through it in a positive proportional way and although there is room for further investigation into some areas certain limitations have prevented this. I have used ohms law as a guide and related my experiment     to it.

...read more.

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