Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be...
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Transcript of Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be...
![Page 1: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/1.jpg)
Electromagnetic Induction
PhysicsTobler
![Page 2: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/2.jpg)
What is electromagnetic induction?
►Voltage can be created by changing the magnetic field within a coil of conducting wire
►Either magnet or conductor can be moving
►In 1831, discovered simultaneously by Faraday in England and Henry in the US
►No voltage source needed!!
![Page 3: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/3.jpg)
James Clark Maxwell
►In the 1860s, Maxwell stated: A changing electric field will create a
magnetic field The magnitude of the magnetic field
depends on how fast the electric field is changing
The induced magnetic field will be at right angles to the electric field
![Page 4: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/4.jpg)
Faraday’s Law
►Voltage depends upon 2 things:# of loops (magnetic field strength)
Rate at which the magnetic field changes (How fast the magnet or coil moves in the field)
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Video Clips
►Magnetism in current carrying wire►Force on a current carrying wire►Motor vs generator
![Page 6: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/6.jpg)
Generators
►Move the coil instead of the magnet►Mechanical energy to electrical energy
Opposite of a motor►One complete rotation=one complete
cycle in voltage and current How many cycles/second in US?
►60 cycles/sec
![Page 7: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/7.jpg)
Large Generators►Power plants use much
larger generators►Turbines used to turn the
coil within large magnetic fields
►What is used to turn the turbine? Usually steam, also wind
and water
![Page 8: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/8.jpg)
Transformers►What does a transformer do?
Used to step up or step down voltages►How it works
Consists of an iron core to guide magnetic fields
A/C is sent through the first coil This creates a changing magnetic field This creates a voltage in the second coil
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Power Transmission►Using A/C generators and transformers,
power can be transmitted great distances at very high voltages and very low currents
► Low current=low energy loss….Why? High currents would cause the wires to heat
up Loss of heat=loss of energy
►Conservation of energy In the home 120 W=120 V * 1 A Power lines 120 W= 120,000 V * 0.001 A
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How transformers are used in Power Grid
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Hydroelectric Dam
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Hoover Dam Power Plant
![Page 13: Electromagnetic Induction PhysicsTobler. What is electromagnetic induction? ► Voltage can be created by changing the magnetic field within a coil of conducting.](https://reader035.fdocuments.net/reader035/viewer/2022062407/56649e445503460f94b38894/html5/thumbnails/13.jpg)
Hoover Dam Power Plant
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Nuclear Power Plant
Use heat from nuclear reaction to turn the water to steam to turn the turbines to generate the electricity.
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Coal Power Plant
Use heat from burning of coal to turn the water to steam to turn the turbines to generate the electricity.
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Solar Power PlantUse solar energy to heat water to steam to turn the turbine to generate electricity
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Examples of Electromagnetic Induction
►Microphones►Speakers►Motors and generators►Metal Detectors►Traffic lights►Tape recorders and VCRs