This is a strong, short-lived magnet created by a looped electrical current. a force of attraction/repulsion due to the spin of electrons. this is a machine that will convert mechanical, nuclear, or chemical energy into electrical energy. a propagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum. this is a net gain or loss of electrons. this is a machine that converts electrical energy into mechanical energy. this is a flow of electrons that creates a charge, one of the fundamental forms of energy.