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Aristide Mooyaart 11E Investigating how temperature affects the resistance in a wire Prediction / theory: All substances in the world are made up of protons, neutrons and electrons. All atoms have a nucleus in the centre that is made up of neutrons and protons, and a certain number of electrons circling around it; these electrons circling around the nucleus have a negative charge. These electrons orbit the nucleus in shells; they occupy different shells with the rules that: -The first shells (nearest to the nucleus are always occupied first -The maximum of electrons any shell can hold is 2n^2 (where n = the shell number) -The outer-most shell containing electrons can only hold a maximum of 8 electrons To demonstrate this here is a model of a metal atom (iron): All metals are known as n-type semiconductors as they all conduct electricity but all have resistance at room temperature. Metal atoms can bond together to form a giant structure,...

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