Overview

A good electrical conductivity is the same as a small electrical resistance. An electric current will flow through all metals, however, they still have some resistance, meaning the current needs to be pushed (by a battery) in order to keep flowing. The bigger the resistance, the harder we have to push (and the smaller the current is). Current flows easily through copper thanks to its small electrical resistance, without much loss of energy. This is why copper wires are used in mains cables in houses and underground (although overhead cables tend to be aluminum because it is less dense). However, where size rather than weight is important, copper is the best choice. A thick copper strip is used for lightning conductors on tall buildings like church spires. The copper strip has to be thick so that it can carry a large current without melting.

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