1. Rubber: Used in electrical cords, gloves, and mats to prevent electrical shocks.

2. Plastic: Found in everything from electrical plugs to food containers, it's a great insulator.

3. Wood: Commonly used for building structures and furniture, it resists the flow of electricity.

4. Glass: Used in windows, light bulbs, and other applications, glass is a good electrical insulator.

5. Air: While it may seem surprising, air is actually a very good insulator. That's why high-voltage power lines are suspended in the air.