Plan an experiment to investigate how the thickness of a metal wire affects its resistance. Resistance = potential difference across the wire / current in the wire.
You have six lengths of metal wire, each of different thickness, an ammeter, voltmeter, power supply, connecting leads and micrometer. You may use other apparatus normally available in a school laboratory. You are not required to do the experiment.
Draw a circuit diagram; explain briefly how to carry out the investigation; state the key variables to keep constant; draw a results table with column headings and units (no readings required); explain how to use the readings to reach a conclusion.