The resistance of a conductor depends on three main factors. First, it depends on its length. The resistance is directly proportional to the length of the conductor, meaning a longer wire offers more resistance.

Second, it depends on the area of cross-section. The resistance is inversely proportional to the area of cross-section, so a thicker wire offers less resistance than a thin wire of the same material.

Finally, resistance depends on the nature of its material. Different materials have different electrical properties, which determine how much they oppose the flow of current. This relationship is expressed by the formula $R = \rho \frac{l}{A}$.