Which of the following materials is classified as an insulator?

Rubber is classified as an insulator because it has a high resistivity, meaning it does not easily allow the flow of electrical current. This characteristic makes rubber an ideal material for preventing electrical shocks and protecting individuals from electrocution hazards. In a healthcare setting, rubber is commonly used in the insulation of wires and in personal protective equipment, helping to ensure safety when handling electrical devices.

Materials such as metal, wet skin, and saltwater are not classified as insulators. Metal is a good conductor of electricity, which means it easily allows electric current to flow through it. Wet skin also increases conductivity because moisture on the skin can facilitate the flow of electric current. Similarly, saltwater is conductive due to the presence of ions, allowing electricity to travel through it more easily than through pure water. Understanding these differences is crucial for recognizing and mitigating electrocution hazards in healthcare environments.