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How does the diameter or cross-sectional area of a wire affect its resistance?
Member rating: No Rating | Words: | Submitted: Thu Jan 29 2004
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PHYSICS How does the diameter or cross-sectional area of a wire affect its resistance? Aim: I am going to investigate how the diameter, or gauge, of a wire affects its resistance. In order for me to do this, I will need to find as many different diameters of wire as I can. I will cut each one to a reasonable length (probably about 10cm), then connect it to a battery pack and measure the current and voltage (with an ammeter and voltmeter respectively). From these readings I will calculate the resistance, using the formula: R = V / I (Resistance = Voltage / Current) The scale by which the diameter of wires is measured is called SWG (standard wire gauge) which confusingly goes up as the wire gets thinner. However I shall not use this in my graphs, as I do not know enough about SWG to make any worthwhile observations. The...
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