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Notes Science
Essential Question(s)What are the basic properties of electromagnets?How do I vary the strength of an electromagnet?
Tennessee SPI Objective:Describe the basic principles of an electromagnet.
Check for UnderstandingExperiment with an electromagnet to determinehow to vary its strength.
SPI 0807:12.2Electromagnets
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Electromagnets
Notes ScienceSPI 0807:12.2
Electromagnets
F.Y.I. -Electric current in the wire produces a magnetic field which lines up atoms in the domains of the iron core forming an electromagnet.
An electromagnet consists of a solenoid wrapped around an iron core attached to a source of electricity
Notes ScienceSPI 0807:12.2
Electromagnets
Electromagnet Properties
You can adjust the strength of an electromagnet two ways
Unlike permanent magnets, electromagnets can be turned on and off as needed.
1) Use more electrical current2) Use more coils in the solenoid
Electromagnets: Three Main Components
Notes ScienceSPI 0807:12.2
Electromagnets
(1) Solenoid , (2) Iron Core, (3) Source of electricity
Notes Science
Commonly found in electrical motors and switches
Also used to…To lift objects
Example: Junkyard crane-magnetsExample: Maglev trains
To propel objectsExample: Railguns as weaponsExample: Railguns as launch platforms
To look inside of peopleExample: Magnetic Resonance Imaging (MRI)
SPI 0807:12.2Electromagnets
How do we use electromagnets?
Notes Science
To lift objects: Example: Junkyard crane-magnetsVideo Clip: Scrapyard Electromagnet In Action
SPI 0807:12.2ElectromagnetsHow do we use electromagnets?
Notes ScienceSPI 0807:12.2
ElectromagnetsHow do we use electromagnets?To lift objects: Example: Maglev trains (magnetic levitation)Video Clip (show 1st 45 sec): How Maglev Trains Work
Notes ScienceSPI 0807:12.2
ElectromagnetsHow do we use electromagnets?
To propel objects: Example: Railguns as weaponsVideo Clip (stop at 2 min:15 secs): US Navy Railgun
Notes ScienceSPI 0807:12.2
ElectromagnetsHow do we use electromagnets?
To propel objects: Railguns as launch platforms (for spacecraft)NASA is testing spacecraft launch railguns to replace rockets
Notes ScienceSPI 0807:12.2
ElectromagnetsHow do we use electromagnets?
To propel objects: Railguns as launch platforms (for aircraft)Video Clip (stop at 1:08 secs): Electromagnetic Catapult
SPI 0807:12.2ElectromagnetsNotes ScienceHow do we use electromagnets?
To Look Inside of People: Magnetic Resonance Imaging (MRI)Video Clip: MRI Magnetic Field Strength
Here is an example of a question you might see on a quiz or test.
Questions ScienceSPI 0807:12.2Electromagnets
Here is an example of a question you might see on a quiz or test.
Questions ScienceSPI 0807:12.2Electromagnets
Here is an example of a question you might see on a quiz or test.
Questions ScienceSPI 0807:12.2Electromagnets
Here is an example of a question you might see on a quiz or test.
Questions ScienceSPI 0807:12.2Electromagnets