Physics – 4.2.4 Resistance | e-Consult

The resistance of a metallic wire is directly proportional to its length. This means that as the length of the wire increases, the resistance also increases.

This is because the electrons flowing through the wire have to travel a longer distance, encountering more atoms of the metal. Each collision with an atom impedes the flow of electrons, increasing the overall resistance. More atoms mean more potential collisions, hence higher resistance.