03-07-2012, 12:17 PM
Power Brokers
Nikola Tesla:
More than a century ago, physicist Nikola Tesla envisioned a future in which power stations would beam electricity directly into homes and businesses. He built a 20-story transmission tower on Long Island with the goal of demonstrating such a feat, but it never became operational. The Serbian immigrant died a pauper.
Fulton Innovation's eCoupled:
Like MIT, eCoupled uses paired coils to transmit power, though over much shorter distances. A year ago, Fulton Innovations demonstrated pads and car cups that charge devices placed on or inside them. The company is now working with Motorola and Herman Miller to develop gadget-powering office furniture.
Powercast:
Early last year, the Pennsylvania company Powercast unveiled several prototypes powered by radio waves from a transmitter hidden inside a household object such as a desk lamp. The system delivers a couple watts over short
distances. Wireless holiday lights were available as of the end of last year.
MIT Witricity:
MIT first demonstrated WiTricity midlast year, lighting an incandescent bulb many feet distant from the powering coil. "Electricity [already] comes to our walls," Karalis says. "We just want to bring it from there to the center of our rooms wirelessly." The university is in talks with companies interested in commercializing the technology.
FAQs
What's WiTricity good for?
It could eliminate that rat's nest of cords under your desk. You would no longer have to wrangle for an outlet at business conferences. And your home would keep your gadgets constantly powered up.
Can a single transmitting coil power multiple devices?
Theoretically, yes.
Will WiTricity be just like Wi-Fi networks today?
Yes, although like Wi-Fi, WiTricity could be free in some locations and a for-fee service in others. Creating a standard frequency that would allow all your gadgets to be powered at all WiTricity hotspots is an issue.
Will batteries become obsolete?
No. Items (like laptops) that we use indoors might not require batteries. But gadgets like cameras that we use on the go would still need them.
What if my dog fell asleep between the wall coil and my computer?
"Line of sight is not required," says MIT doctoral student Aristeidis Karalis, who did many of the calculations and predictions for the system. But because the transfer efficiency declines with distance, each room would need its own distributing coil.
But will it give my dog cancer?
Biological organisms are not strongly affected by magnetic fields, and the MIT team believes that safety won't be a concern. Still, more experiments will be needed.