chapter 21

a current carrying a wire wrapped around an iron core.

a device that converts electric energy into kinetic energy.

northern lights. collision of atoms that are ejected from the sun cause the atoms to emit light.

_______uses a magnetic field to turn motion into electricity.

a current that alternates from positive to negative.

when electrons flow in one direction it is called an _______ ________.

a device that changes the voltage of an alternating current before transmitting the current.

a field that surrounds all magnets.

a group of atoms with magnetic fields all facing one direction.

an atmosphere around the earth that deflects most of the sun's harmful charged particles.