1. Bell Work Science SPI 0807.12.2 Electromagnets
Tuesday, February 22, 2017
What are magnetic poles?
Which poles attract each other; which repel?
Where is the magnetic south pole located on earth?
What is the difference between a permanent magnet and a temporary magnet?

2. Notes Science SPI 0807.12.2 Electromagnets Tennessee SPI Objective:
Describe the basic principles of an electromagnet.
Essential Question(s)
1) What are the components of electromagnets?
2) How do I vary the strength of an electromagnet?
I Can Statement
I can describe how to build an electromagnet.
Success Criteria
I can prove that I understand this topic by designing a
simple electromagnet.

3. Electromagnets
An electromagnet consists of a solenoid wrapped around an iron core attached to a source of electricity
Simple Electromagnet
Iron Core
Source of
Electricity
Solenoid
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.

4. F.Y.I: Why Are Some Substances Magnetic?
SPI 0807:12.2
Electromagnets
Notes
Science
F.Y.I: Why Are Some Substances Magnetic?
All atoms have magnetic fields with north and south poles
Atoms in objects are found in areas called domains.
If the north and south poles in a domain line up, this makes the object magnetic.
If they don’t line up, the object is not magnetic.

5. Electromagnets can be turned on and off as needed
Solenoid
Iron Core
Source of
Electricity
Electromagnets can be turned on and off as needed
You can adjust the strength of an electromagnet two ways
1) Increase the electrical current
2) Increase the number of coils

6. Electromagnets: Three Main Components
(1) Solenoid
(2) Iron Core
(3) Source of Electricity
Identify the 3 Components
Identify the 3 Components
Identify the 3 Components

7. How do we use electromagnets?
SPI
Electromagnets
Notes
Science
How do we use electromagnets?
Commonly found in electrical motors and switches
Also used to…
To lift objects
Example: Junkyard crane-magnets
Example: Maglev trains
To propel objects
Example: Railguns as weapons
Example: Magnetic catapults (launch platforms)
To look inside of people
Example: Magnetic Resonance Imaging (MRI)

8. How do we use electromagnets?
To lift objects: Example: Junkyard crane-magnets
Video Clip: Scrapyard Electromagnet In Action

9. How do we use electromagnets?
To lift objects: Example: Maglev trains (magnetic levitation)
Video Clip (show 1st 45 sec): How Maglev Trains Work
Maglev Train
Maglev Train

10. How do we use electromagnets?
To propel objects: Example: Railguns as weapons
Video Clip (stop at 2 min:15 secs): US Navy Railgun
Rail Gun
Rail Gun

11. How do we use electromagnets?
To propel objects: Magnetic Catapult (for spacecraft)
NASA is testing magnetic catapults to replace rockets
Magnetic Catapult

12. How do we use electromagnets?
To propel objects: Magnetic catapults (for aircraft)
Video Clip (stop at 1:08 secs): Electromagnetic Catapult

13. How do we use electromagnets?
To Look Inside of People: Magnetic Resonance Imaging (MRI)
Video Clip: MRI Magnetic Field Strength

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