Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b....
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Transcript of Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b....
![Page 1: Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b. Explain the flow of electrons in terms of alternating.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649f535503460f94c774aa/html5/thumbnails/1.jpg)
Ch. 8 - Magnetism
Ch. 8 - Magnetism
SPS10. Students will investigate the properties of electricity and magnetism.
b. Explain the flow of electrons in terms of alternating and direct current.
c. Investigate applications of magnetism and/or its relationship to the movement of electrical charge as it relates to electromagnets, simple
motors, permanent magnets
![Page 2: Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b. Explain the flow of electrons in terms of alternating.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649f535503460f94c774aa/html5/thumbnails/2.jpg)
Ch. 8 - Magnetism
Ch. 8 - Magnetism
I. Characteristics of Magnets Magnetism Magnetic poles Magnetic field Magnetic domain
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A. MagnetismMagnetism
force of attraction or repulsion between unlike or like poles
due to the arrangement of electrons
closely related to electricity
![Page 4: Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b. Explain the flow of electrons in terms of alternating.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649f535503460f94c774aa/html5/thumbnails/4.jpg)
B. Magnetic PolesMagnetic Poles
like poles repel
unlike poles attract
a broken magnet creates new poles
![Page 5: Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b. Explain the flow of electrons in terms of alternating.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649f535503460f94c774aa/html5/thumbnails/5.jpg)
C. Magnetic FieldMagnetic Field
area around a magnet where magnetic forces act
field lines show direction of field (NS)
![Page 6: Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b. Explain the flow of electrons in terms of alternating.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649f535503460f94c774aa/html5/thumbnails/6.jpg)
D. Magnetic DomainMagnetic Domain
groups of atoms with aligned magnetic poles
in a magnetized object, domains are all aligned
domain
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Ch. 22 - Magnetism
Ch. 22 - Magnetism
II. Uses of Magnetic Fields Electromagnet Speaker Motor
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A. ElectromagnetElectromagnet
strong, temporary magnet formed when current is passed through a coil of wire surrounding an iron core
acts like a bar magnet when current is on
![Page 9: Ch. 8 - Magnetism SPS10. Students will investigate the properties of electricity and magnetism. b. Explain the flow of electrons in terms of alternating.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649f535503460f94c774aa/html5/thumbnails/9.jpg)
B. SpeakerSpeaker
electrical energy mechanical energy
wire coil moves back & forth as its magnetic field interacts with the field of a fixed magnet
forced vibration causes the cone to move sound
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C. MotorMotor
electrical energy mechanical energy
electromagnet rotates between the poles of a fixed magnet
commutator reverses the poles of the e’magnet
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C. Motor
brushes & wires to battery field magnet
armature & commutatorassembled motor
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Ch. 22 - Magnetism
Ch. 22 - Magnetism
III. Producing Electric Current Electromagnetic Induction Electric Generator DC & AC Transformer
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A. Electromagnetic InductionElectromagnetic Induction
producing a current by moving a wire through a magnetic field
some microphones work just like mini-speakers in reverse
sound waves cause coil to move current
Dynamic Microphone
Coil
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B. Electric GeneratorElectric Generator
mechanical energy electrical energy
armature is rotated between magnet poles
magnetic field induces a current in the wire coil
MOTORGENERATOR
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B. Electric Generator Hydroelectric Dam
PE of lake water is converted to KE
mechanical KE turns the generator shaft which creates electrical energy
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C. DC & ACDirect Current (DC)
current flows in one direction dry cells
Alternating Current (AC) current reverses its direction
at regular intervals electrical outlets
Video
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D. TransformerTransformer
increases or decreases AC voltage primary coil AC produces a magnetic field that
induces AC in the secondary coil voltage ratio = ratio of turns in each coil
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D. TransformerStep-up Transformer
increases the voltage more turns power plants
Step-down Transformer decreases the voltage fewer turns household appliances
(hairdryers, etc.)