Magnetism Magnets and Magnetic Fields Physics Chapter 21 Section 1 Pages 766-769.
Magnetism Chapter 21
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Transcript of Magnetism Chapter 21
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MAGNETISMCHAPTER 21
Essential Question-What is magnetism and how does it relate to electricity?
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Vocabulary Magnetic Domain Magnetic Field Magnetosphere Alternating Current Aurora
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Direct Current Electromagnet Generator Motor Transformer
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How magnets work.
Magnetic field-a space around a magnet where the magnetic force is active.
Magnetic Domain-a group of atoms with their magnetic fields pointing in the same direction.
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Magnetosphere- the space affected by the Earth’s magnetic field.
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The Sun and the Earth’s magnetosphere.
Charged particles
Aurora-the light given off from the sun’s charged
particles crashing into atoms in the Earth’s atmosphere.
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Natures Magnets
The Lodestone- the original natural magnet
Examples of Biomagnetism
Homing Pigeons
Monarch Butterflies
Migratory Birds
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Early Uses of Magnetism The Compass
•The needle will point North and South•Turn the compass so that they line up
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Electromagnet- a wire with current flowing through it that is wrapped around an iron core.
How do they work?
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Uses for Electromagnets Televisions/ Computer- CRT screens Automobiles- ignition, starter motor, automatic
doors Motors Sound/ Speakers-An electromagnet draws the
speaker diaphragm, allowing the music to be played.
Scrap yards-In scrap yards, electromagnets lift cars and other magnetic objects.
Fire Doors and Automatic Doors Relays/ Switches Sorting Metals
Read more: 10 Uses for an Electromagnet | eHow.co.uk http://www.ehow.co.uk/list_5908429_10-uses-electromagnet.html#ixzz1hm19hFDy
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Electric Motors- any machine that changes electric energy into kinetic energy. http://www.arthursclipart.org/engineer/engineer/electric%20motor.gif
What is a motor? How does it keep running?
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Electric Current- the flow of electric charge.
Alternating Current (AC)-
a current that changes direction. (used in
plug in electronics)
Direct Current (DC)-A current in which
electrons only flow in one direction. (used in
battery powered electronics.
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http://sustainableconsciousnessnetwork.wordpress.com/
Electric Generator- uses magnets to convert motion energy to electricity
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Magnets are used in machines to create and change current
Power Plants contain Electric Generators, machines that use a magnetic field to turn motion into electricity
Transformer- a machine that changes the voltage of an alternating current without losing much energy.
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Superconductors - metals at extremely low temperatures have next to no resistance so next to no loss of energy as heat.
A magnet floats above a superconductor
Particle accelerators use superconductors to get particles up to nearly the speed of light,
http://www.chemistryexplained.com/St-Te/Superconductors.html
http://www.telegraph.co.uk/science/large-hadron-collider/7829090/The-God-particle-may-exist-in-five-forms-Large-Hadron-Colliders-rival-project-finds.html
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Magnetic Resonance Imaging (MRI)
MRI Scanner MRI Imagehttp://greglw.blogspot.com/1971/01/item-04-mri-scanner-magnetic-resonance.html
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Ferromagnet Ferromagnet- A permanent magnet made from
a material such as iron. Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets.
The shape of a ferromagnet is not important
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Electromagnet vs. Natural Magnets
Electromagnet Natural magnet (lodestone)
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Specific shapes of magnets Bar
magnet Horseshoe
magnetDisk Magnet
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bar magnet horseshoe magnet disk magnet magnetic copper repel ferromagnetic aluminum
pole iron nickel attract core