Electric charge — Recall

Using a simple electron model, explain the difference between electrical conductors and insulators, giving examples of each.

Conductors, such as metals like copper and silver, contain free (delocalised) electrons that are able to move through the material, allowing electric current to flow easily. Insulators, such as plastic, rubber and glass, have no free electrons - their electrons are tightly bound to their atoms - so they cannot conduct an electric current.