The resistance of a conductor changes with:

The physical resistance of a standard conductor depends on four main factors: its material, length, cross-sectional area, and temperature. For most conductive metals like copper, as the temperature increases, the atoms vibrate more vigorously. This impedes the flow of electrons and causes the resistance to rise. While current and voltage are mathematically related to resistance via Ohm's Law (R = E / I), changing the voltage or current does not change the physical, fundamental resistance of a fixed ohmic conductor. Humidity might affect outside insulation, but not the internal resistance of the metal.