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What is this electromagnetic device called?

  1. Jul 6, 2016 #1
    What is this electromagnetic device called? Ive seen a couple. There is this one: as well as one similar but you must keep the magnet in motion to generate electricity.

    I would like to make one of these, but I dont know the name of it which makes it hard to search for instructions and a general overview.

    Thanks!
     
  2. jcsd
  3. Jul 6, 2016 #2

    OmCheeto

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    From the description give with the video:

    I would call it an "air core transformer".
     
  4. Jul 6, 2016 #3
    It is a transformer with removable core. When the metal core is inserted the magnetic field becomes stronger and thus it generates stronger voltage in the secondary coil.

    However I am not completely sure what he is doing when we see the reverse effect, the voltage to become stronger when the core is removed...
     
  5. Jul 6, 2016 #4

    Averagesupernova

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    The windings are likely both in series with the bulb in the latter portion of the video. The bolt is drawn in with much less force.
     
  6. Jul 6, 2016 #5

    OmCheeto

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    Thanks!
    Like Delta² , I was puzzled by the "that's not quite right" second part of the video.
     
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