Define the term electrical insulator in relation to the properties of materials and name one material which is a good electrical insulator. - Leaving Cert Engineering - Question (k) - 2018

An electrical insulator is a material that prevents the flow of electric current. This means that when a voltage is applied, the insulator does not allow electrons to move freely, thus stopping the passage of electricity through it. Insulators have high resistance and are typically used to protect against unwanted current flow and to ensure safety in electrical circuits.