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What factors affect the resistance of a wire?
Member rating: No Rating | Words: 1400 | Submitted: Sun Feb 24 2008
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An Investigation into the Electrical Resistance of Wires Introduction My Physics coursework is about the electrical resistance of wires and to see what affects the resistance. Electrical resistance is the measure of the degree to which an object opposes the passage of electrical current. Ohm's Law states that at a constant temperature, the resistance is the amount if current flowing for any given voltage. This can be written by the formula: R is the resistance in Ohms V is the voltage in Volts I is the current in Amperes Scientific Background A metal consists of a grid of atoms, each with a shell of electrons. The outer electrons are free to separate from their own atoms and travel through the grid, making the metal a conductor. When an electrical potential (a voltage) is applied across the metal, the electrons drift from one end of the conductor to the other under the influence of the electric field causing...
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