Answer:
Through ohm's law.
R=V/I.
Measure voltage applied (V) using voltmeter and current passing through it (I) using ammeter. Substitute in ohm's law R=V/I.
Resistance charts for various lengths, materials, and gauges of wire are available online and in scientific books. See related links (below) for one example. A 14-gauge copper wire commonly used in lighting circuits has about 2.5 ohms per 1000 feet, for example.