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Bell Work

Learn about magnetic poles, electromagnet components, and their uses. Discover how to build and adjust the strength of an electromagnet. Explore practical applications from junkyard magnets to MRI technology.

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Bell Work

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  1. SPI 0807.12.2 Electromagnets Bell Work Science 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. SPI 0807.12.2 Electromagnets Notes Science 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. 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. 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 2) Increase the number of coils 1) Increase the electrical current

  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. SPI 0807.12.2 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: 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

  14. SPI 0807.12.2 Electromagnets Science Questions

  15. SPI 0807.12.2 Electromagnets Science Questions

  16. SPI 0807.12.2 Electromagnets Science Questions

  17. SPI 0807.12.2 Electromagnets Science Questions

  18. SPI 0807.12.2 Electromagnets Science Questions

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