Magnets and Magnetic Fields
A magnet created by wrapping a current-carrying wire around a ferromagnetic core.
What is an electromagnet?
A device that uses a magnetic field to transform mechanical energy to electric energy.
What is a generator?
An electric current that flow in one direction.
What is direct current?
Applying a magnetic field to a ferromagnetic material making the magnetic domains align for only a short time.
What is a temporary magnet?
A force of attraction of repulsion between the poles of two magnets.
What is a magnetic force?
A current that reverses direction in a regular patter.
What is alternating current?
Hydroelectric, solar, geothermal, and wind.
What are renewable resources?
Cobalt, nickel, and iron.
What are examples of ferromagnetic elements?
A region in a magnetic material in which the magnetic fields of the atoms all point in the same direction.
What is a magnetic domain?
A coil of wire connected to a rotating shaft, a permanent magnet, and a source of electric energy.
What is an electric motor?
A device that increases or decreases the voltage of an alternating current.
What is a transformer?
What happens when the magnet inside a wire loop stops moving?
No electric current is produced.
Elements including iron, nickel, and cobalt, that have an especially strong attraction to magnets.
What are ferromagnetic elements?
Attraction and repulsion.
What forces do magnets apply to each other?
When magnetic fields align and stay aligned.
What is a permanent magnet?
A magnet that quickly loses its magnetic field after being removed from a magnetic field.
What is a temporary magnet?
A device in a motor that reverses the direction of the current in the electromagnet to keep the motor spinning.
What is a commutator?
Moving either a wire through a magnetic field or moving a magnet through a wire coil produces...
An electric current.
This transformer has fewer loops in the secondary coil than in the primary coil.
What is a step-down transformer?