the region of space affected by the earth's magnetic field
group of atoms whose fields point in the same direction
electric current that changes its direction repeatedly
device that transforms electrical energy into kinetic energy
Surrounds a magnet and exerts a magnetic force on other magnets
magnet created by wrapping a current carrying wire around an iron core
light display that occurs when charged particles trapped in the magnetosphere collide with Earth's atmosphere above the poles
a device that increases or decreases the voltage of alternating current
device that uses a magnetic field to turn kinetic energy into electrical energy
how can we make an electromagnet stronger?
1- Increase the voltage. 2- Increase the size of the iron core. 3- Increase the number of coils
how can we create a magnetic field around a wire?
run electricity through it
what is the difference between alternating current and direct current?
An alternating currents direction varys in different ways, where a direct currents direction stays the same
what's the purpose of an electric motor?
changes electricity into motion
what's the purpose of a generator?
changes magnetism + kinetic enrgy into electricty
how can we create current using only a wire and a magnet?
moving a looped wire in the middle of a magnetic field
in a bar magnet, where are the lines of force the strongest?
at the poles