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Science & Technology
Wireless electricity? It's here!
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<blockquote data-quote="Num7" data-source="post: 80730" data-attributes="member: 1"><p>Katie Hall was shocked the second she saw it: a light-bulb glowing in the middle of a room with no wires attached.</p><p></p><p>Looking back, it was a crude experiment, she remembers: a tiny room filled with gigantic copper refrigerator coils -- the kind you'd see if you cracked open the back of your freezer.</p><p></p><p>She walked in and out between the coils and the bulb -- and still the bulb glowed.</p><p>"I said: 'Let's work on this. This is the future.'"</p><p></p><p><strong>What's the trick?</strong></p><p></p><p>"We're going to transfer power without any kind of wires," says Dr Hall, now Chief Technology Officer at WiTricity -- a start-up developing wireless "resonance" technology.</p><p></p><p>"But, we're not actually putting electricity in the air. What we're doing is putting a magnetic field in the air."</p><p></p><p>It works like this: WiTricity build a "Source Resonator" -- a coil of electrical wire that generates a magnetic field when power is attached.</p><p></p><p>Can spider silk help you self-heal? Meet the genius behind 3-D printing Is this the ultimate space suit for Mars?</p><p></p><p>If another coil is brought close, an electrical charge can be generated in it. No wires required.</p><p></p><p>"When you bring a device into that magnetic field, it induces a current in the device, and by that you're able to transfer power," explains Dr Hall. And like that, the bulb lights up.</p><p></p><p>Read more: <a href="http://edition.cnn.com/2014/03/14/tech/innovation/wireless-electricity/index.html" target="_blank">Wireless electricity? It's here - CNN.com</a></p></blockquote><p></p>
[QUOTE="Num7, post: 80730, member: 1"] Katie Hall was shocked the second she saw it: a light-bulb glowing in the middle of a room with no wires attached. Looking back, it was a crude experiment, she remembers: a tiny room filled with gigantic copper refrigerator coils -- the kind you'd see if you cracked open the back of your freezer. She walked in and out between the coils and the bulb -- and still the bulb glowed. "I said: 'Let's work on this. This is the future.'" [B]What's the trick?[/B] "We're going to transfer power without any kind of wires," says Dr Hall, now Chief Technology Officer at WiTricity -- a start-up developing wireless "resonance" technology. "But, we're not actually putting electricity in the air. What we're doing is putting a magnetic field in the air." It works like this: WiTricity build a "Source Resonator" -- a coil of electrical wire that generates a magnetic field when power is attached. Can spider silk help you self-heal? Meet the genius behind 3-D printing Is this the ultimate space suit for Mars? If another coil is brought close, an electrical charge can be generated in it. No wires required. "When you bring a device into that magnetic field, it induces a current in the device, and by that you're able to transfer power," explains Dr Hall. And like that, the bulb lights up. Read more: [url="http://edition.cnn.com/2014/03/14/tech/innovation/wireless-electricity/index.html"]Wireless electricity? It's here - CNN.com[/url] [/QUOTE]
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