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How does the resistance of a wire depend on the length?
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How does the resistance of a wire depend on the length? Background Knowledge: An electric current is the flow of charge that is measured in Amperes using an Ammeter. Current in a metal is due to the flow of electrons that are repelled from the negative terminal and flow towards the positive terminal. The terminals are made positive and negative because of the chemicals in the battery. The nichrome wire that the electrons have to pass through is made of atoms. Each of these atoms consists of a nucleus, which is made up of protons and neutrons. In a metal the atoms are held tightly to the nucleus. Some of the outer electrons are called 'free electrons' because they can be knocked out of place easily. When a free electron leaves an atom, the atom becomes an 'ion' because the charge is not equal. Ions that are left are vibrating in a...
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