Permanent Temporary Electromagnets

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Presentation transcript:

Permanent Temporary Electromagnets Types of magnets Permanent Temporary Electromagnets

Magnet An object that attracts certain materials Iron and steel

Magnets Magnetism: force exerted by a magnet Magnetic Poles: part of magnet where force is strongest Every magnet has 2 poles (North & South) Opposites attract Like repel Break a magnet = 2 new magnets

Magnets Magnetic field: region around magnet in which magnet exerts force Magnetic field lines

Magnets Magnetic domain: group of atoms whose magnetic fields are aligned

Magnets Permanent and temporary magnets Drop Expose to high temperatures Earth: magnetic field

Electromagnetism Magnetism that results from an electric current Charge particle---electron---moves and creates a magnetic field

List 3 ways that the strength of an electromagnet can be controlled. What are the 2 benefits of an electromagnet?

Electromagnet Magnet made by placing a piece of iron or steel (ferromagnet ic core) inside a coil of wire

Electromagnet

Electromagnet Can be turned off and on Can control the strength of the magnet Voltage source (increase = increase strength) # times coil is wrapped around the core (increase # = increase strength) How close together the coils are (closer = increase strength) Size of ferromagnetic core (increase size = increase strength)

Magnets--Current Magnets can be used to generate electric current. Generator: a device that converts the energy of motion (kinetic energy) into electrical energy Shaft of generator turns Rotation of shaft causes coils of wire to spin---creates a magnetic field Coils cross magnetic field line-----electric current created

Magnets--Current Direct current Electric charge flows in ONE direction Produced by batteries Alternating current Flow of electric charge that reverses direction at regular intervals Home and school

Magnets--Current Transformer A device that increase or decreases voltage Use magnetism to control the amount of voltage Consists of 2 coils of wire wrapped around an iron ring

Magnets--Current Watt Unit of measurement for power