Wireless power could have cellphone users beaming - buy electric toothbrush

Your mobile phone or laptop will soon charge itself like a wireless transfer of information.
Researchers at the Massachusetts Institute of TechnologyMIT)
In the United States, it is reported that they can send a lot of electricity now-enough to ignite 60-
Watt bulb-through the room through the induction between two devices tuned to resonate with each other.
They want to use this "strong coupling" phenomenon to wirelessly charge and even run mobile devices.
Induction-the ability to change the magnetic field to generate current-was discovered by Michael Faraday in 1831.
It makes the generator, transformer and motor work.
So far, sensing is only feasible in close range, such as between the charger of the electric toothbrush and the mobile phone.
At a further distance, the power loss is too great to be in Marin solgoić, a mobile phone that is run out of battery (The obvious soulya-cheech)
A theoretical physicist at the Massachusetts Institute of Technology wants to know if he can improve the efficiency of long-distance sensing.
Based on his experience with the laser, he knows that objects that resonate at the same frequency can easily exchange energy.
He set out to see if he could transmit electricity using magnetic resonance.
Solja ić and his research team have now built a coil with the right performance.
The coil is driven by mains current and naturally oscillates at 10 MHz.
Unlike the energy received by the antenna, their devices store energy internally in the form of oscillating current and charge.
The coil produces a strong magnetic field, but when the oscillating magnetic field surrounds the coil, most of the electrical components of the magnetic field are trapped inside the coil.
The oscillating magnetic field effectively transmits the power of the entire laboratory to a receiver tuned to the same frequency.
Reducing the external electric field is critical to safety.
Andrei Kul, a member of the MIT team and theorist, said: "We want to use the magnetic field for coupling and limit the electric field," because the magnetic field will not interact with most objects, including biological tissues.
Douglas Stone, a theoretical physicist at Yale University, said: "I think this is great . " He is not affiliated with MIT.
"This is something anyone can think of for a century.
"Stone agrees with MIT researchers that while there is still a lot of work to be done before your gadgets are charged wirelessly, the technology will be transferred from the lab to the real world.
"There is no fundamental problem," Stone said . "
"It will work.
"Journal reference and colon;
Science Express (
June 7, 2007, p 1)