magnetism chapter 21
DESCRIPTION
Essential Question- What is magnetism and how does it relate to electricity?. Magnetism Chapter 21. Vocabula ry. Magnetic Domain Magnetic Field Magnetosphere Alternating Current Aurora. Direct Current Electromagnet Generator Motor Transformer. How magnets work. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/1.jpg)
MAGNETISMCHAPTER 21
Essential Question-What is magnetism and how does it relate to electricity?
![Page 2: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/2.jpg)
Vocabulary Magnetic Domain Magnetic Field Magnetosphere Alternating Current Aurora
![Page 3: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/3.jpg)
Direct Current Electromagnet Generator Motor Transformer
![Page 4: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/4.jpg)
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.
![Page 5: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/5.jpg)
Magnetosphere- the space affected by the Earth’s magnetic field.
![Page 6: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/6.jpg)
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.
![Page 7: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/7.jpg)
Natures Magnets
The Lodestone- the original natural magnet
Examples of Biomagnetism
Homing Pigeons
Monarch Butterflies
Migratory Birds
![Page 8: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/8.jpg)
Early Uses of Magnetism The Compass
•The needle will point North and South•Turn the compass so that they line up
![Page 9: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/9.jpg)
Electromagnet- a wire with current flowing through it that is wrapped around an iron core.
How do they work?
![Page 10: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/10.jpg)
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
![Page 11: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/11.jpg)
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?
![Page 12: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/12.jpg)
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.
![Page 13: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/13.jpg)
http://sustainableconsciousnessnetwork.wordpress.com/
Electric Generator- uses magnets to convert motion energy to electricity
![Page 14: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/14.jpg)
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.
![Page 15: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/15.jpg)
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
![Page 16: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/16.jpg)
Magnetic Resonance Imaging (MRI)
MRI Scanner MRI Imagehttp://greglw.blogspot.com/1971/01/item-04-mri-scanner-magnetic-resonance.html
![Page 17: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/17.jpg)
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
![Page 18: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/18.jpg)
Electromagnet vs. Natural Magnets
Electromagnet Natural magnet (lodestone)
![Page 19: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/19.jpg)
Specific shapes of magnets Bar
magnet Horseshoe
magnetDisk Magnet
![Page 20: Magnetism Chapter 21](https://reader033.vdocuments.us/reader033/viewer/2022061522/56816336550346895dd3c300/html5/thumbnails/20.jpg)
bar magnet horseshoe magnet disk magnet magnetic copper repel ferromagnetic aluminum
pole iron nickel attract core