LiveScience: Wireless Power Lights Bulb 7 Feet Away

The energy is transferred using magnetic resonance which increases efficiency and removes the need of an unobstructed view from the device to the power source. However, 40% efficiency is terrible if we are to conserve energy but the idea sounds intriguing.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
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Agreed, and have just taken the Guardian to task about a statement they make regarding Nikolai Tesla's original efforts in this field:

Seems to me it could have some useful applications where wires are going to cause a problem but we don't want to suddenly unwire everyone's home or will have to generate twice the power to cover the losses.

I am also a little concerned that the general public should ever by exposed to energised coils, easy enough to discharge them, probably even accidentally.

I saw the news item. For people who cannot cope
with the usual spagettii of leads from many
gadgets. And a figure was given of 96% efficient.
Like a bad transformer. Will the folk who would
buy such gear be the same folk who complain about
Electricity cables overhead? And does a metal
sided item like a fridge short the radiating
panel? So many questions about a naff idea but
some knowledgable people were interviewed. Looks
like we need those turbines and their few percent
contribution to power this coming waste

It looks like they are combining radio and transformer principles.
Modulate the transformer frequency and pick it up with a tuned receiver. Crystal radios have been around for decades, they don't need batteries, but they can't produce much volume.
I imagine if you lived close enough to a radio tower you could rig up a charging system off their carrier wave.

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This sounds like something I was discussing a short while ago about using an oscillating magnetic field to charge electrical components down an oil well.

The big problem was we're talking miles of distance between the wellhead and the downhole component. Also deviation will mean the metal production tubing will curve away so the component is out of line of sight.

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Tesla had it right. Nevelle Marzwell of JPL, (friend of Gene Meyers of http://www.spaceislandgroup.com ) wants a way to beam power directly from space to articles on the ground.

I seem to remember the HAM community in an uproar over transmitting data over electrical lines...Maybe all this will be tried out on Moonbases first to reduce infrastructure.

Magnetic resonance? I thought any osciallting magnetic field had to be coupled with an oscillating electric field (the coupled behavior is how they can propogate in the first place). So basically, you're microwaving your room, and you have devices that can pick up on the power.

I don't see how this is fundamentally different from broadcasting any other sort of EM.

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They don't mention frequency. Normal power is 60Hz, AM radio is 500-1600KHz, FM is 80-120MHz, microwaves are GHz. I heard some military aircraft use 400Hz for powering their electric motors to keep them small and light.

__________________
'Sir........, I don't like these numbers.'
'Then hire somebody that can change them!'
("`-/")_.-'"``-.,,
\. . `; -._( );, `)
(v_,)' _ )`-. \ ``'`
_.- _..-/ /((.'
((,.-' ((,/