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Resistance of a Wire Coursework

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Introduction

Resistance of a Wire Coursework The investigation I will be carrying out is to find the resistance of a piece of wire. This piece of wire will be my dependant variable throughout the investigation, as the length of wire I use will change. The wire that I chose to use is Constantan 28SWG, and I will change the length of the wire in order to measure the resistance of each length. If I decided not to change the length of the wire for my experiment there are other dependant variables I could use such as the material of the wire or the thickness of the wire. As I am changing the length of the wire, the material of the wire and its thickness will be kept the same throughout my investigation, they will be known as the controlled variables. Before I carried out my investigation I decided to make a hypothesis of what I thought the results would show. ...read more.

Middle

This is a diagram of the circuit I will be using: 6v A AA When carrying out this experiment there are certain safety procedures I have to adhere to. I must make sure to keep my circuit well away from water so there is no danger of getting electrocuted. When using my power box I should also try to keep the voltage as low as possible. It should be low enough to stop the wires becoming very warm and overheating but still high enough to have enough power flowing through the circuit to get accurate results. I chose 6v, as this is the middle setting of power from the power supply. When I have got a set of results I will immediately plot a graph so I can see what my points look like and therefore see if I have done the experiment correctly. If the points I have plotted form a straight line through the point of origin (0,0) ...read more.

Conclusion

20cm and 40cm that the resistance of 40cm is not double the resistance of the 20cm piece of wire. When I carried out my experiment I didn't have to make any changes from my original plan. Even though I carried out the experiment as best I could there are still chances for errors to occur. I may not have measured the length of wire exactly as I found that it was quite hard to measure the wire with a ruler. However I think these results are a very good indication of what these results are. All my points are as I thought they would be, the resistance increasing each time and I found nothing of surprise in my investigation. Next time I am doing this investigation, there are certain things I could do to improve my results, I could use more measurements so I get more results and therefore my graph will be more accurate. I could also maybe look at other differences like the ones I mentioned earlier, like changing the type of wire each time or the thickness. ...read more.

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