Some common insulator materials are glass, plastic, rubber, air, and wood. Insulators are used to protect us from the dangerous effects of electricity flowing through conductors. Sometimes the voltage in an electrical circuit can be quite high and dangerous.

If we have to make circuit using a bulb we will cut a wire in between and then we wil place the thing like plastic wood rubber etc attach all these things one by one to the two free ends of the wire if the bulb glows that thing is aconductor or if the bulb does not glow it means that the thing used is an insulator

Plastic is not a good conductor of electricity because it is an insulator. Insulators are materials that do not allow the flow of electric current through them easily. On the other hand, conductors are materials that allow the flow of electric current through them easily.

Insulators like plastic have tightly bound electrons in their atoms, which makes it difficult for the electric current to pass through. In contrast, conductors like copper and silver have loosely bound electrons that can move freely within the material, allowing the flow of electric current.

Let's delve deeper into the properties of plastic and why it is not a good conductor of electricity.

1. Structure of Plastic:
- Plastic is a polymer, which means it is made up of long chains of repeating units.
- The atoms in plastic molecules are held together by strong covalent bonds.
- These covalent bonds lock the electrons in place, making it difficult for them to move and conduct electricity.

2. Insulating Properties:
- The tightly bound electrons in plastic do not have the freedom to move from atom to atom, meaning they cannot carry an electric charge.
- This lack of electron mobility prevents the flow of electric current through plastic.
- Insulators like plastic are commonly used to cover electrical wires to prevent the flow of electricity and reduce the risk of electrical shocks.

3. Comparison with Conductors:
- Conductors like copper and silver have loosely bound electrons in their outermost energy levels.
- These electrons are free to move and can carry electric charge from one atom to another.
- This high electron mobility in conductors allows them to easily conduct electricity.

In conclusion, plastic is not a good conductor of electricity because its tightly bound electrons prevent the flow of electric current. On the other hand, materials like copper and silver have loosely bound electrons that can move freely, making them excellent conductors of electricity.