Electricity and Magnetism

Which of the following would be an example of an insulator?

• iron

• copper

• rubber

• aluminum

If these magnets above were brought close together they would…

• attract

• repel

As the distance between two magnets increases (they get farther apart), the force between them..

• increases

• decreases

• stays the same

An electromagnet's poles may be reversed by..

• decreasing the voltage of the coil

• increasing the number of coils

• changing the direction of current flow

• altering the material used to make the coils

How do electromagnets differ from regular magnets?

• they can be turned on and off

• their strength can be changed

• their polarity can be reversed

• all of the above

What is one way you can make an electromagnet stronger?

• Add more coils of wire to the nail

• reverse the poles of the magnet

• use a smaller battery

• remove all the coils and the nail

Which electromagnet is stronger?

• A

• B

What two forces are required for generators and electric motors to work?

• magnetism and thermal

• electricity and magnetism

• electricity and thermal

• magnetism and radiant

What is the transfer of energy in a generator?

• electrical to mechanical

• mechanical to electrical

• chemical to electrical

• mechanical to chemical

What is the transfer of electricity in a motor?

• chemical to mechanical

• electrical to mechanical

• mechanical to electrical

• mechanical to chemical