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Wireless electricity? It's here



In the house of the future, wire-free energy transfer could be as easy as wireless internet.

If all goes to WiTricity's plans, smartphones will charge in your pocket as you wander around, televisions will flicker with no wires attached, and electric cars will refuel while sitting on the driveway.

WiTricity have already demonstrated their ability to power laptops, cell-phones, and TVs by attaching resonator coils to batteries -- and an electric car refueller is reportedly in the works.
 

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We already have wireless electricity feeding every house:



Been hearing about this idea as long as I've been alive. And they're still running into the exact same problems Tesla had when he was experimenting with it.
Those look like wires, John :001_huh:
 

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Dark Energy
Tesla concluded that all of the phenomena which he had observed, implied the presence of a medium . . . consisting of independent carriers capable of free motion - besides the air, another medium is present. This invisible medium is capable of carrying waves of energy through all substances, which suggests that, if physical, its basic structure is much smaller than the atoms which make up commonplace materials, allowing the stream of matter to pass freely through all solids. It appears that all of space is filled with this matter.
~CS~
 

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What connects the transformer windings to each other? That's what I was getting at.
Gotcha.

Well maybe if we start making transformers with the primary windings on the pole and the secondary in the house, and somehow concentrate the flux through the air, we'd eliminate service drops :thumbup:
 

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Anything that sits very close to the energy source will work without RF cooking you, like a cell phone sitting on the charge pad or even a vehicle parked directly over the charging source. Once you separate the two, efficiency drops way off with a multitude of other issues.

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Source:
http://spectrum.ieee.org/green-tech/mass-transit/a-critical-look-at-wireless-power

The idea the Wireless Power Consortium is pushing is that eventually you’ll be able to buy a single charging pad that will recharge whatever device you place on top, regardless of brand. Treffers is keen to bring such interoperability to what he sees as a blossoming consumer technology, but he doesn’t expect it to get to the point where you can recharge your mobile gizmo while using it. “It’s not like you can charge your BlackBerry while sitting on the couch,” he says.

Eberhard Waffenschmidt, a Philips electrical engineer working with Treffers,
has examined the question of what distances are possible for resonant inductive charging. His calculations suggest that the prototype systems that Intel and WiTricity have demonstrated are pushing the limits of what can practically be done without efficiency plummeting to ridiculously low levels. And even if poor efficiencies could be tolerated, the RF field levels required to send truly useful amounts of power over even modest distances would be above what you could reasonably expose people to. “All the journalists had missed this,” says Waffenschmidt, adding that “[charging] pads don’t have this problem.”

Is there no way then to increase the distance you can send power wirelessly? Of course there is, but not inductively. If you have a clear path, you could use microwaves or laser beams, as has been demonstrated many times. Or just keep it simple. “Sunlight is excellent for long-distance power transfer,” quips Treffers.
 

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