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Transcript
Chapter 18 Electromagnetism A magnet is an object that radiates a force field that is called a magnetic field. (p.512) Magnetic field lines Magnetism is a naturally occurring force that can be felt but not seen. The compass needles follow the magnetic field lines! Magnets have two poles: North Pole – the part of a magnet pointing towards the earth’s north magnetic pole. South Pole – pole opposite the north seeking pole. Electric current in wire creates magnetic field! Chapter: 18 Electricity is related to magnetism! (p. 518) Magnetic fields can produce electric current in conductors. Whenever electricity flows, a magnetic field is present. 1 An electromagnet is a magnet created by an electric field that can be turned on and off. (p. 519-520) electromagnets An electric motor is a device that uses an electric current to turn an axle. (It converts electrical energy to mechanical energy) See pg 522 (electric motor) (electric bell) Chapter: 18 A generator uses motion to produce an electric current. ex: hydroelectric plant (water turns turbine that turns a generator) (p. 527) 2
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