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Electromagnets - PowerPoint PPT Presentation


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Electromagnets. What is magnetism? Created by moving electrons Has north and south poles. What is magnetism?. In magnetic materials like Iron Groups of atoms join together The magnetic field of each atom adds together to create a larger magnetic field. How do you make a magnet?.

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Presentation Transcript
electromagnets
Electromagnets
  • What is magnetism?
    • Created by moving electrons
    • Has north and south poles
what is magnetism
What is magnetism?
  • In magnetic materials like Iron
    • Groups of atoms join together
    • The magnetic field of each atom adds together to create a larger magnetic field
how do you make a magnet
How do you make a magnet?
  • In unmagnetized iron, the magnetic fields of the domains point all different directions
  • To create a magnet
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Electromagnets
  • Electricity and magnetism are related
    • Electric current in a wire creates a magnetic field
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Electromagnets
  • Creates a magnetic (force) field
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Electromagnets
  • A coiled wire creates a greater magnetic field
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Electromagnets
  • One use of electromagnets is doorbells
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Electromagnets
  • Scrapmetal cranes also use electromagnets
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Electromagnets
  • Loudspeakers are also electromagnets
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Electromagnets
  • House telephones are also electromagnets
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Electromagnets
  • Energy transfer
    • Electromagnets transfer what kind of energy to which?
    • To _____________?
      • Creates a force that can move iron things