Question

Which of the following materials would be classified as an insulator?

Options

• Iron and steel

• Copper, silver, and gold

• Silicon and germanium

• Rubber, plastic, glass, and ceramic

Answer 1

Insulators include materials such as rubber, plastic, glass, and ceramic. These materials have extremely high resistivity and do not allow electric current to flow easily. Their resistivity may be about 1018 times greater than that of metals.