Independent variable: The variable we change, The number of coils of wire, Has a range and intervals, Is on the left of a results table, Is on the x axis of a graph, Dependent variable: The variable we measure, The strength of the magnetic field, Measured by the number of paper clips picked up, We take repeat measurements of this and calculate a mean, On the right of a results table, On the y axis of a graph, Control variables: We try to keep these the same, Controlling these helps to make a valid test, The type of wire, The diameter of the wire, The presence and type of core, The current supplied,

Electromagnetism practical

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