Experiment to Find the Effect of Length of Wire on It s Resistance
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Background Information
Resistance, Ohm's law; the current through a metal wire is proportional to the difference across it (providing the temperature stays constant). Current - the flow of electrons around a circuit, Voltage - the electrical pressure within that circuit. Using this information, I know that; to find the resistance of a wire we simply divide voltage by current ( R = V ).
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Knowing this, I can find the resistance quickly, and come to a conclusion faster on the affect of length of wire on the resistance. Resistance is the amount electricity is slowed down whilst passing through a conductor. It is slowed down by the electrons repelled by the power supply, colliding with ions. Copper has a different ion arrangement and, a low resistance, this also renders copper useless for this experiment. The two options for wires in this experiment are, nichrome and constantan.
For a flow of electrons there needs to be a circuit. A complete circuit needs electrical conductors, metals are good conductors because they have free electrons which can leave the atom and move around the circuit...