grade 6 , con 3 , lesson 4

............ is a material that cannot allow electric current to flow through.

• Iron

• Copper

• Cobalt

• Plastic

The electric wires can be made of ....... or...

• wood - plastic.

• rubber - wood.

• aluminum - copper.

• plastic - rubber.

The electric wires are covered with ........... as it is..........

• copper - good conductor of electricity.

• plastic - bad conductor of electricity.

• iron - strong material.

• plastic - electric conductor.

All the following materials are electric insulators, except

• rubber.

• plastic.

• wood.

• steel

Which of the following is a poor conductor of electricity and is used to coat wires ?

• A conductor.

• Non insulator.

• A switch.

• A battery.

Metallic materials are considered electric............, while glass and rubber are considered electric .....

• insulators conductors.

• circuits - conductors.

• conductors - insulators.

• insulators - energy.

Wood and plastic are electric insulators.

• True

• False

Electric current can flow through all materials.

• True

• False

Electric wires are covered with plastic to protect us from electric shock.

• True

• False

Electric insulators only allow electric current to pass through them.

• True

• False