Hafsa's Assessment

The strength of an electromagnet can be affected by

• changing the current in the wire

• adding more coils

• increasing the mass of the iron core

• All of the above

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• an enemy

A motor will make electrical energy change into 

• motion energy
• chemical energy
• mechanical energy
• nothing

In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.

• Wind
• Water
• Magnets
• Circuits

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

• magnetism and thermal 
• electricity and thermal 
• electricity and magnetism 
• magnetism and radiant 

Generators are devices that convert _____ energy into _____ energy.

• chemical; mechanical
• mechanical; electrical
• electrical; mechanical
• potential; kinetic

In a _______ a spinning turbine moves magnets which generates an electric current.

• Motor

• Generator

What is the transfer of electricity in a generator?

• Mechanical to Electrical 
• Physical to Potential 
• Electrical to Mechanical
• Yogurt to Light

What is the transfer of electricity in a motor?

• chemical to mechanical 
• electrical to mechanical
• mechanical to electrical 
• physical to potential