Electricity can be dangerous so we need to know how to use it safely. Insulators protect us from electricity. A test kit, like those used by electricians, is used to test for materials which complete an electrical circuit and conduct electricity, and those which are insulators. Plastic, rubber and wood are shown to be insulators, while metal is a conductor of electricity.
Before watching the clip, children could be asked to sort materials into whether they are conductors or insulators, by testing different materials in a circuit with a bulb. They could think about why it is useful to have certain materials as insulators and some as conductors and think about their application in the real world. After watching the clip, children could look around the classroom and find objects which are insulators and those which are conductors. The link between electrical conductors and insulators can be made with thermal conductors and insulators as well.