"electrical current that flows in one direction and then in the opposite direction, back and forth", "alternating current" "electrical current that flows in just one direction", "direct current" "any object that attracts certain metal objects", "magnet" "the part of a magnet where the ability to push or pull is the strongest", "pole" "the area around a magnet where it can push or pull another magnet", "magnetic field" "a tool that shows directions by letting a needle line up with Earth's magnetic field", "compass" "a magnet that is made when an electric current flows through a coiled wire around an iron rod", "electromagnet" "a tool that changes electrical energy into sound", "loudspeaker" "a tool that changes sound into electric signals", "microphone" "a tool that changes electrical energy into energy of motion", "motor" "a tool that changes energy of motion into electrical energy", "generator"
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