A student investigates the relationship between the diameter and the resistance of wires. The following apparatus is available: - wires with different diameters - instrument for measuring the diameter of a wire - metre ruler - ammeter - voltmeter - power supply. Other apparatus normally found in a school laboratory is also available. Plan an experiment to investigate how the diameter of a wire affects its resistance. Resistance $$\(R\)$$ is given by the equation $$\(R=\frac{V}{I}\)$$, where $$\(V\)$$ is the potential difference (p.d.) across the wire and $$\(I\)$$ is the current in the wire. You do not need to write about safety precautions. In your plan: - draw a circuit diagram to show the circuit you use - explain briefly how to do the investigation - state one key variable to keep constant - draw a table, or tables, with column headings, to display the readings (you are not required to enter any readings in the table) - explain how to use your results to reach a conclusion.

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