Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron,...
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Transcript of Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron,...
![Page 1: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/1.jpg)
Unit 8 Magnetism
![Page 2: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/2.jpg)
Permanent Magnets
Permanent magnet– naturally magnetic
materials– iron, cobalt, and nickel
Magnetic Properties
Poles (north and south)
If you chop them in half, each half still has a N and S pole
– Like poles repel
– Opposite poles attract
![Page 3: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/3.jpg)
What makes materials magnetic?
•Groups of atoms that have aligned electrons are called domains
•domains are aligned in permanent magnets
![Page 4: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/4.jpg)
Magnetic Field
Every magnet creates a magnetic field in the space around it
This is how magnets have forces between them without even touching
![Page 5: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/5.jpg)
Electromagnets
– an electrical current passes through a coil of wire wrapped around some iron
– more current, stronger magnet
– Can be turned on and off
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Electromagnetic induction
– Flowing current induces a magnetic field
– a moving magnet induces electrical current to flow
![Page 7: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/7.jpg)
Electric Motor
converts electrical energy into mechanical energy
A current causes an electromagnet to rotate
![Page 8: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/8.jpg)
Electric Generators
Converts mechanical energy into electrical energy
A coil of wire rotates within a magnetic field-generates a current
Generator simulation
![Page 9: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/9.jpg)
Making electricity
Begin with fuel (chemical energy- fossil fuels) or another form of energy (nuclear, solar, hydro)
Convert from one form of energy into mechanical energy (turn turbine- large fan)
Turbine will rotate a magnet in a coil of copper wire (generator!!)
Electrons flow in the wire…viola..electricity
![Page 10: Unit 8 Magnetism. Permanent Magnets Permanent magnet – naturally magnetic materials – iron, cobalt, and nickel Magnetic Properties Poles (north and south)](https://reader036.fdocuments.in/reader036/viewer/2022081821/56649ebb5503460f94bc41b7/html5/thumbnails/10.jpg)
Energy conversion
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Transmitting electricity
Increase voltage for travel
Decrease voltage when at your home
Use transformer – electrical device that changes voltage