[LINK] Some shocking news about wireless electricity

[Adam Todd]

Isn't it amazing!  About four or so weeks ago I posted about 
Witricity on this very list!  I gave a broad overview as to how it 
works and why it's a means of powering active RFID devices.

I also recall saying at some stage, I just wish my Mobil and laptop 
didn't need to be plugged in to charge!

Well here it is!

Of course no details on how much energy is used in the power emitting 
device.  To drive a 60 watt light bulb I'd guess it's pretty damn 
high!  I know I need 5 watts to drive a 300 mW circuit.  But then I 
don't have lab and bottomless pit of money to throw at R&D :)

Anyway, Witricity is on the way - and the repercussions of "EMF" 
around the body all the time resonating at high levels will follow in 
the arguement as to why it's a bad thing.

Just imagine - You no longer need to eact Breakfast, Lunch of Dinner, 
just stand near the wall and get a full recharge!  (rofl)



http://www.smh.com.au/news/technology/some-shocking-news-about-wireless-electricity/2007/06/08/1181089277018.html



Massachusetts Institute of Technology (MIT) researchers said Thursday 
they have developed a wireless energy transfer technology that could 
ensure wireless devices are always charged up and ready to go.

The team at MIT, one of the top US academic "laboratories" for new 
inventions, has roadtested the fledgling technology and shown that it 
can power a 60 watt bulb from a power source two meters away.

That's more than enough juice to supply an average laptop, said Marin 
Soljacic, a professor of physics at MIT in Cambridge, Massachusetts, 
who has been working on this project for several years.

The concept behind the technology is simple and based on the idea 
that two resonant objects on the same resonance frequency can 
exchange energy efficiently.

For this experiment, the MIT team used electromagnetic resonators in 
the form of copper coils, which oscillated at a certain frequency, 
trading energy within a given electromagnetic field. One of the coils 
was attached to a power source. The other acted as a receiver.

The researchers, having proved that the technology dubbed "WiTricity" 
does work, plan to refine it to make it more efficient, although the 
range over which wireless power can be delivered probably won't 
extend beyond a room or a factory floor.

However, they are confident they can enhance the system and make it 
reliable enough so that consumers can dispense with power cords and 
even batteries for their laptops, PDAs, Blackberries or cellphones if 
they are being used in the same room as the power source.

"This is a major milestone," said Soljacic, commenting on the 
experiment, the details of which appear in the journal Science. "The 
technology is almost at the point where it could be used for a 
practical application."