Title: Notes
1SPI 080712.2 Electromagnets
Notes
Science
Tennessee SPI Objective Describe the basic
principles of an electromagnet.
Instructions 1) First click on "View" from the
top-menu bar. 2) Then click on "Slide Show" from
the drop-down menu. 3) Then use the right-arrow
button on your keyboard to advance through this
presentation.
Check for Understanding Experiment with an
electromagnet to determine how to vary its
strength.
Essential Question(s) What are the basic
properties of electromagnets? How do I vary the
strength of an electromagnet?
2SPI 080712.2 Electromagnets
Notes
Science
Electromagnets
- An electromagnet consists of a solenoid wrapped
around an iron core attached to a source of
electricity
- 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.
3SPI 080712.2 Electromagnets
Notes
Science
- Unlike permanent magnets, electromagnets can be
turned on and off as needed.
- You can adjust the strength of an electromagnet
two ways
1) Use more electrical current 2) Use more coils
in the solenoid
4SPI 080712.2 Electromagnets
Notes
Science
Electromagnets Three Main Components
- (1) Solenoid , (2) Iron Core, (3) Source of
electricity
5SPI 080712.2 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 Railguns as launch platforms
- To look inside of people
- Example Magnetic Resonance Imaging (MRI)
6SPI 080712.2 Electromagnets
Notes
Science
How do we use electromagnets?
- To lift objects Example Junkyard crane-magnets
- Video Clip Scrapyard Electromagnet In Action
7SPI 080712.2 Electromagnets
Notes
Science
How do we use electromagnets?
- To lift objects Example Maglev trains (magnetic
levitation) - Video Clip (show 1st 45 sec) How Maglev Trains
Work
8SPI 080712.2 Electromagnets
Notes
Science
How do we use electromagnets?
- To propel objects Example Railguns as weapons
- Video Clip (stop at 2 min15 secs) US Navy
Railgun
9SPI 080712.2 Electromagnets
Notes
Science
How do we use electromagnets?
- To propel objects Railguns as launch platforms
(for spacecraft)
- NASA is testing spacecraft launch railguns to
replace rockets
10SPI 080712.2 Electromagnets
Notes
Science
How do we use electromagnets?
- To propel objects Railguns as launch platforms
(for aircraft) - Video Clip (stop at 108 secs) Electromagnetic
Catapult
11SPI 080712.2 Electromagnets
Notes
Science
How do we use electromagnets?
- To Look Inside of People Magnetic Resonance
Imaging (MRI) - Video Clip MRI Magnetic Field Strength
12SPI 080712.2 Electromagnets
Science
Questions
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a quiz or test.
13SPI 080712.2 Electromagnets
Science
Questions
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14SPI 080712.2 Electromagnets
Science
Questions
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15SPI 080712.2 Electromagnets
Science
Questions
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16SPI 080712.2 Electromagnets
Science
Questions
Here is an example of a question you might see on
a quiz or test.