G-4 Science CH. #7 Magnetism

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Michael J Stark MOST's picture

Magnetism, Electromagnets, and Electrical Currents

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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