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What Factors Affect the Resistance of a Piece of Wire.

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What factors affect the Resistance of a piece of wire. Planning I will investigate by experiment the factors that affect the resistance of a piece of wire. There are many factors so I have chosen to focus on length. We measure resistance in ohms ?. I will try to make a fair experiment by using the same equipment for all of my readings. This will give me better and clearer results. There are some factors, which are hard to control such as heat and condition of the wire. Ohm's law is: "The amount of current flowing in a circuit made up of pure resistances is directly proportional to the electromotive forces impressed on the circuit and inversely proportional to the total resistance of the circuit." Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. The collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through the wire. Method I will take a piece of wire and attach it to a board in 50cm lengths, but it won't be separate lengths it will be one long piece wrapped round the nails at either side of the board in a zig zag pattern. ...read more.


50cm 100cm 150cm 200cm 250cm 300cm 350cm 400cm 450cm 500cm Gathering results. I did the experiment many times and most of my readings fell very close but one or two were odd so I didn't use them in finding the average. As I did the experiment so many times I think this made my results fairly accurate. I used different power packs one day so I re did took the results with the same one but I found it made very little difference. I tried to make it as fair as an experiment as I could but areas, which I couldn't control or found hard to, were: * Heat * Condition * Shape * Insulation of the wire * Thickness I have made a list of results of the test: 50cm Ammeter Voltmeter Average A/V Resistance?1dp 1. 4.95 8.17 - - 2. 7.17 8.66 6.96/8.43 3. 6.83 8.24 6.96/8.43 1.2 4. 6.88 8.41 6.96/8.43 100cm 1. 2.89 9.29 - - 2. 4.08 9.63 4.07/9.51 3. 4.08 9.38 4.07/9.51 2.3 4. 4.05 9.52 4.07/9.51 150cm 1. ...read more.


Evaluation I think this experiment went well. It was well controlled and I took many readings giving me accurate answers. The things such as heat, insulation and condition I found hard to control as my readings were taken on different days. I thought that the change in power packs would make a difference to my readings, which it didn't, so I could have saved time there by not re doing most of my readings. From my results, table and graph I can see that the experiment I conducted was reliable. My table shows that the first lot of results for each measurement shows abnormality as they give far different readings from all of the others I took for each measurement. Also on the graph I see that there are no odd averages as it is almost straight. If I were to do this experiment again I would use pointers instead of crock clips, as they are more accurate. This is because the tips have a smaller surface area and less energy would be lost if I used them. Otherwise my experiment was fair and produced very good results. ?? ?? ?? ?? Sophie Johnson 11lk Physics coursework 02/05/07 04:16 1 ...read more.

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