conductor & insulator

What allows metals to conduct electricity?

• Free protons

• Free electrons

• Fixed neutrons

• Static ions

Why is rubber an insulator?

• It has free electrons

• It lacks free electrons

• It is magnetic

• It dissolves in water

What happens when you touch a metal doorknob after rubbing socks on carpet?

• Nothing

• The doorknob melts

• You feel a shock

• It becomes magnetic

Why are wires made of copper?

• Copper is flexible

• Copper is an insulator

• Copper is cheap

• Copper is a good conductor

What is the purpose of plastic coating on wires?

• To act as an insulator

• To make them colorful

• To conduct electricity better

• To make them heavier

Pure water is a:

• Good conductor

• Superconductor

• Poor conductor

• Magnetic material

Magnetic material

• It has free ions

• It is thicker

• It is colder

• It is lighter

How do rubber gloves protect electricians?

• By conducting electricity

• By blocking electric current

• By generating heat

• By attracting lightning

Which of these is NOT an insulator?

• Wooden ladder

• Rubber gloves

• Copper wire

• Plastic coating

Superconductors have:

• High resistance

• Zero resistance

• Variable resistance

• Magnetic resistance