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Physics Coursework Investigating how the length of a wire affects its resistance Sean Connolly 12M I have decided for my coursework that I will investigate how length affects the resistance of a wire. Background information on resistance In 1826, George Ohm discovered that: The current flowing in a metal is proportional to the Potential difference across it providing the temperature remains constant. He then developed a formula: - Resistance (R) = Voltage (V) ? Current (I) Resistance is a measure of how easily the electrons can move through a metal. Therefore a low resistance means that the electrons can move more easily. Aim In my investigation I shall try to see if the length of a piece of wire affects its resistance. Prediction I predict that the length of wire will affect its resistance. I am making this prediction because all metal s contain electrons in their outer shell. The larger the surface area of the piece of wire, the more...

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