Insulators are those materials which do not allow electric current to pass through them. Insulators have a number of uses like:
- Asbestos is used for covering the wires in high-power machines.
- Ebonite is used for making covers for resistance-boxes.
- Paper and paraffin wax are used for cable insulation when oil impregnated and for covering transformer conductors.
- Shellac is used in the form of insulating varnish.
