Module 7 Magnetism
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14 Terms
magnetism
the properties and interactions of magnets
magnetic field
a region of space that surrounds a magnet and exerts a force on other magnets and objects made of magnetic materials
magnetic poles
the regions of a magnet that exert the strongest force
magnetic domains
groups of atoms with aligned magnetic poles
electromagnetic force
the attractive or repulsive force between electric charges and magnets
electromagnetism
the interaction between electric charges and magnets
solenoid
a single wire wrapped into a cylindrical wire coil
electromagnet
a temporary magnet created when there is a current in a wire coil
electric motor
a device that changes electrical energy into mechanical energy
electromagnetic induction
the generation of an electric current by a changing magnetic field
generator
a machine that uses electromagnetic induction to transform mechanical energy into electrical energy
direct current
electric current that is always in one direction through a wire
alternating current
electric current that reverses the direction in a regular pattern
transformer
a device that increases or decreases the voltage of an alternating current