1. Rubber: Rubber is a common insulator. Its molecular structure makes it difficult for electrons to flow freely, preventing the passage of electricity.
2. Glass: Glass is another excellent insulator. Its atoms are tightly bound together, making it challenging for electrons to move.
3. Wood: While some types of wood can conduct electricity under specific conditions, in general, wood is a good insulator. The presence of lignin and cellulose, along with its porous structure, hinders the flow of electricity.
