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By Ashley Wragg 2,401 words A Physics Investigation of the Resistance Of A Piece of Wire? Aim: The aim of this investigation is to investigate and discover if the length of a piece of metal wire effects its resistance when electricity is passed through it. Prediction Before I make a prediction I shall explain about atoms, free electrons, electricity and resistance. Electricity travels through a conductor, in this case a length of wire, by means of free electrons. Electrons are the smallest parts of an atom that is situated in shells (similar to the layers in onions). An atom has protons that are positively charged and neutrons that have a neutral charge (no charge) in the centre. The neutrons and protons are like the core of the atom. There are then electrons that are negatively charged circulating round outside the core (see diagram 1). There are as many electrons as protons in an...

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