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Magnetic The property of creating or responding to forces from magnets. Permanent magnet A material that remains magnetic without outside energy being supplied. Electromagnet A magnet made with wires and electric current. Electromagnetic induction Using a moving magnet to create electric current or voltage. Ferromagnetic metal A material like iron, which has strong magnetic properties. Transformer Can change voltage and current with very little loss of power. They can change the high voltage from the main power lines to the 120 volts with your appliances use.