Physics Coursework Dilemma: ResistanceWatch
I'm doing an investigation into resistance, specifically the effect different diameters and lengths of wire has on the resistance of said wire.
I'm a little stuck in my plan. I've actually conducted the investigation, but I've come to explaining my prediction in scientific terms. Any textbooks I have are useless on the subject.
My prediction is thus; the longest, thinnest wire will resist the current by the greatest amount. All's well and good up to there, but then I have to explain why this happens.
I think it has something to do with the wire being thinner, and containing less electrons/less electrons being able to fit through it; but I feel this is not nearly in depth enough.
I also have no idea what the length has to do with the resistance. I've probably forgotten something I've been taught, but I've lost my old book anyway.
Any help on the matter is much appreciated. As detailed as possible would be fantastic. I don't plan to copy and paste, so feel free to quote text books.
My prediction is thus; the shortest, thinnest wire will resist the current by the greatest amount. All's well and good up to there, but then I have to explain why this happens.
Cheers mate, a real life saver.
Furthermore, if the wire has a smaller diameter, the resistance will be increased, due to the fact that there is a smaller surface area through which the electrons can travel. This is similar to altering a pipe diameter and seeing how much water can flow through at once. By making the diameter smaller, the flow rate of electrons through the material is restricted.
I hope that helps you. If you want any other advice, or help, PM me, or reply here... Good luck with the cw.