Corsework Resistance of a wire
...n, and Nickel Chrome. I on the other hand will only be using Constantan. I will be able to use different wire diameters. This will be the variable I will be changing. I will find the results for three different diameters, only using Constantan. Will it have an effect on the resistance if we use a larger or smaller diameter? I will plot my results onto a graph which will show the relationship between length and resistance. Will there be a pattern? Predictions My prediction is that the thinner the wire, the higher the resistance. The thicker the wire, the lower the resistance. I think this because the thinner the wire is, the less paths there are for electrons in the wire therefore the harder it is for current to flow. This results in the energy not being able to spread out as much, so the resistance will be higher. It is like a corridor if it is wider people will flow quicker because there are more paths to go and you are not all being crowded together. Safety precautions 1. Make sure that the circuit is properly connected before turning the power supply on, and do not touch the apparatus, especially the tested, naked wires until the power is switched off. 2. The changing of the tested wires should only occur when the power is off. 3. Do not carry out the experiment in wet areas, as water is a very good conductor. 4. Do not switch on the power supply when there is no resistant wire and do not turn the power supply up too high because the wires may melt. My investigation. I have done this experiment changing one variable. I have concentrated on diameter. I have used the wire Constantan and changed the diameter each time. The results are as follows: I can put these results onto a graph. Using a graph is a much easier way to see what is happening because you can see if the results go up in a steady line or go down. We can accurately see what the difference it between the 24swg, 26swg and the 28swg. I predict that all three results would be fairly in a line all going through the (0,0) and that the 24swg’s line of best fit would be a lot less steeper than the 26swg’s line of best fit. The graph would show the relationship between resistance and length. Even though I did not test below the 40cm mark I shall start my graph on (0,0) to see what would happen. Analysis In our experiment we mistakenly picked up a Nickel chrome 26swg wire instead of the Constantan 26swg.The results for the Nickel chrome were very far away from the other two wires and I was very suspicious as the results did not follow my prediction yet the other two wires did. I think the Constantan 26swg should have been between the 28 and 24swg wires on the graph. This would have perfectly matched my predictions as I said the smaller the diameter the larger the resistance, and the larger the diameter the smaller the...