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Gcse Physics Investigation: Resistance of a Wire.

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Introduction

GCSE Physics Investigation: RESISTANCE of a wire. Planning experimental procedures. In this investigation, I will be looking at the factors that affect the resistance of a wire. I will select a variable and be sure to keep the other factors constant. I am looking for a pattern in the results and I will be looking at what causes it. * As the length of the wire increases so the resistance increases. * As the width of the wire increases the resistance decreases. * As the temperature of the wire increases so does the resistance. * Various wires have different resistance therefore the type of metal wire must be kept constant. (Nichrome) * The higher the voltage travelling through the wire the more resistance is needed to prevent over heating. Therefore the higher the voltage, the less the resistance. Variables In this experiment one could alter: * The thickness of the wire. * The length of the wire. (I would measure this by using a meter rule.) * The voltage across the wire. (I control this by using the dial on the battery pack.) * The type of metal. (This is not suitable for use in this school.) * The temperature. (I must be sure to only switch the battery on as needed otherwise the temperature will increase when I do not want it to.) ...read more.

Middle

There may be anomalous results if my measurements are not accurate or the other factors are accidentally altered. Apparatus: To perform this experiment you will need a Battery pack, wires, voltmeter, ammeter and wires (of different lengths) of resistance. Method: Set up the circuit as shown in the diagram on the next page and take a reading from the ammeter when the wire of resistance is in place and the correct amount of current is flowing through the circuit. (3 volts) What will I find out? At the end of this experiment I will know if my prediction was correct. I will also have a quantitative result. For example: When the length of the wire doubles the resistance doubles. Overall I will know if the length of the wire has an affect on the amount of resistance. Resources I have used to help me in my planning. I used the textbook "Physics for You" to tell me about resistance, that is where I found out what factors affect resistance. My Physics teacher "Mr Baker" also gave us a brief idea of what we should include in our plan and I used my knowledge to continue from there. Results from Preliminary experiment. I did a preliminary test to see which experiment I would prefer to perform for the main investigation. ...read more.

Conclusion

I think it was a good way to perform the tests and I can't think of any better way. If I could do the experiment again I would ask for more time. With more time I could repeat the experiment, therefore getting a more accurate average and so overall more accurate results. I could also do the experiment using more lengths of wire and once again getting a more accurate result. I think the results I got were accurate enough to show what I needed to know. I could easily work out from the graph that when the length of the wire doubles so does the resistance. There was only one anomalous result and that was the 80cm length of wire. It was not a great mistake and it may have just been a slight error when cutting the wire to the correct length or the voltage may have been slightly incorrect. But it was not greatly incorrect and there was no major mistake in the method. To continue this investigation, as I said earlier, I could test more lengths of wire or I could repeat each length more times. This would give us a more accurate result and a clearer idea of the correct quantitative result. I chose to investigate how the length of the wire alters the resistance but with more time or to continue the experiment further you could test other factors that affect resistance. By Anna Haggarty. Yr 10.6. Mr Baker. ...read more.

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