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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:

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Presentation on theme: "Notes Science Essential Question(s) What are the basic properties of electromagnets? How do I vary the strength of an electromagnet? Tennessee SPI Objective:"— Presentation transcript:

1 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 Understanding Experiment with an electromagnet to determine how to vary its strength. SPI 0807:12.2 Electromagnets 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.

2 Electromagnets Notes Science SPI 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

3 Notes Science SPI 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 current 2) Use more coils in the solenoid

4 Electromagnets: Three Main Components Notes Science SPI 0807:12.2 Electromagnets  (1) Solenoid, (2) Iron Core, (3) Source of electricity

5 Notes Science  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) SPI 0807:12.2 Electromagnets How do we use electromagnets?

6 Notes Science  To lift objects: Example: Junkyard crane-magnets  Video Clip: Scrapyard Electromagnet In ActionScrapyard Electromagnet In Action SPI 0807:12.2 Electromagnets How do we use electromagnets?

7 Notes Science SPI 0807:12.2 Electromagnets How do we use electromagnets?  To lift objects: Example: Maglev trains (magnetic levitation)  Video Clip (show 1st 45 sec): How Maglev Trains WorkHow Maglev Trains Work

8 Notes Science SPI 0807:12.2 Electromagnets How do we use electromagnets?  To propel objects: Example: Railguns as weapons  Video Clip (stop at 2 min:15 secs): US Navy RailgunUS Navy Railgun

9 Notes Science SPI 0807:12.2 Electromagnets How do we use electromagnets?  To propel objects: Railguns as launch platforms (for spacecraft)  NASA is testing spacecraft launch railguns to replace rockets

10 Notes Science SPI 0807:12.2 Electromagnets How do we use electromagnets?  To propel objects: Railguns as launch platforms (for aircraft)  Video Clip (stop at 1:08 secs): Electromagnetic CatapultElectromagnetic Catapult

11 SPI 0807:12.2 Electromagnets Notes Science How do we use electromagnets?  To Look Inside of People: Magnetic Resonance Imaging (MRI)  Video Clip: MRI Magnetic Field StrengthMRI Magnetic Field Strength

12 Here is an example of a question you might see on a quiz or test. Questions Science SPI 0807:12.2 Electromagnets

13 Here is an example of a question you might see on a quiz or test. Questions Science SPI 0807:12.2 Electromagnets

14 Here is an example of a question you might see on a quiz or test. Questions Science SPI 0807:12.2 Electromagnets

15 Here is an example of a question you might see on a quiz or test. Questions Science SPI 0807:12.2 Electromagnets

16 Here is an example of a question you might see on a quiz or test. Questions Science SPI 0807:12.2 Electromagnets


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