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Investigating the resistance of a wire.

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Introduction

Investigating the resistance of a wire In this investigation I am going to find out how different lengths of wire change how easily current flows through wire. What things can I change? The things I can change while doing this experiment are the following: * The length of the wire that I am going to use * The thickness of the wire I am going to use * The material the wire is made out of * The temperature of the wire What I am going to change While I am doing this experiment the only thing that I am going to change is the length of the wire that I am going to use. What will I measure? While doing the experiment I am going to measure, the current each piece of wire will let through. ...read more.

Middle

I then set the circuit up that was needed to make the experiment work. I connected the wire to the metre ruler at both ends of the wire. I connected one end of the wire to the voltmeter I was going to use and the other end of the wire to the ammeter I was going to use. I did this so I could collect the readings I needed to complete the experiment. I took the two readings for when there was 100m of wire. When I had taken these two readings, I moved one side of the ruler so the reading could be taken at 80cm. I repeated this three more times so I could take the readings for 60cm, 40cm, and then 20 cm. ...read more.

Conclusion

I said that was what I thought would happen. I did not state that when the length of wire goes up the current became less. I did not think that would happen. There is a definite pattern in my results. When I worked out the average resistance I plotted the results on my graph. When I had drawn my line of best fit the line nearly includes each of the five points. This means that my results must be quite accurate. Evaluation I think that my results are quite reliable. When you look at my results table you can see that the results are very similar. I did the experiment twice so I could get a more reliable set of results. I think if I repeated the experiment I would possibly get the same results. ...read more.

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