[ausev] wireless charging

[Joby Wieser]

I have been confused by this technology. It seems like with all the interest in environmentally friendly, energy efficient solutions that this wireless charging would be a non starter. 

Can the magnetic resonant version ever be as energy efficient as a wire cable?



No it can't.  When any kind of magenetic field travels through the air it looses strength exponentially with distance.  Thats why a 50,000 watts leaving a radio antenna is picked up by your receiver in the nanowatt range.

Putting your cell phone on a pad to charge wont be too wastefull but the idea of powering all the appliances in a home without plugs would be very costly.

Joby