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The resistance of a wire can be found from the equation $\text{resistance} = \frac{\text{potential difference (p.d.) across wire}}{\text{current in the wire}}$. With the apparatus provided, plan an investigation. Your plan should include a circuit diagram, a short description of how the investigation will be done, the main variables that must be kept unchanged, a table with column headings showing how the data will be presented, and an explanation of how the data will be used to reach a conclusion.