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Wireless Recharging

  1. Jul 28, 2008 #1

    baywax

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    Here's an interesting development.

    Could this be harmful to humans? How safe is electromagnetic induction?


    http://www.livescience.com/technology/061114_wireless_recharge.html
     
  2. jcsd
  3. Jul 28, 2008 #2

    mgb_phys

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    Very safe - the energy is only efficently transferred to a matched antennae and is very short range.
    I once worked on a project to have self heating drinks where youplaced them in an inductor on the counter after buying them, it was perfectly safe to put your hand in the inductor with no chance of burnign yourself, unlike regular glass coffee jugs.
     
  4. Jul 28, 2008 #3

    baywax

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    Cool mgb_phys!

    Is this something that could expand to say... recharging an electric vehicle on the move?
     
  5. Jul 28, 2008 #4

    mgb_phys

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    Not really ;-(
    For practical efficency you ideally need the receiver to fit inside the coil. Or you need a transmitter coil bigger than the receiver and have them close together - ideally less than the coil diameter apart.

    It's great for where you don't want an electrical contact, because you want something watertight sealed (electric toothbrush) or you don't want to bother with a connector (like the cell phone mat). But overall it is more efficent to use a plug if you can.
     
  6. Jul 28, 2008 #5

    baywax

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    In a different article covering the same idea they mention using a laser as a directional influence to concentrate the em waves toward the device, thus, reducing scattered em energy and increasing efficiency. Is this sci fi or an actual probablility?
     
  7. Jul 29, 2008 #6

    baywax

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    To answer my own question I'll reluctantly quote Wicipedia:

    http://en.wikipedia.org/wiki/Wireless_energy_transfer
     
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