Electric force

Which one of these objects is a electrical conductor?

• Metal

• Plastic

• Rubber

• Paper

Which of these objects is an electrical insulator?

• Metal

• Rubber

• Copper

• Gold

A material that does NOT let electricity pass through it is called ...

• An electrical conductor

• An electrical insulator

• An electrical source

• An electric appliance

Voltage is measured in __.

• volts.
• watts.
• coulombs. 

The movement of electrons from atom to atom in a line results in a flow of _____. 

• amperage.
• electric current.
• electromagnetic connectors. 

Current has units: 

• kilowatt·hour 
• ampere 
• coulomb 
• volt 

What 'flows' in a wire?

• Protons
• Neutrons
• Atoms
• Electrons

Why is a battery important in an electrical circuit?

• As a source of energy.

• As a path for electricity to flow through.

• As a connector to connect all parts of a circuit.

When a circuit is open, the lamp is _________?

• on

• off

How can it be explained that someone's hair can stick to a balloon?

• There is electricity.

• There is too much dust in the air.

• The person needs to wash his hair.