我記得將近十年前，有天晚上在家搞電腦，所有的電線糾結成一團，我在心情毛起來之後跟媽媽妹妹說: 看著吧，以後一定"有無線電源"這種東西的出現!
真的有耶~
希望再過十年後每個家裡都有可以連無線網路的電子看板，可以即時更新新聞、天氣、棒球比數、音樂....大大的掛在牆上還可以遙控。
唔~~~好想要一個。
Wireless power system shown off
Electric tech could make plugs obsolete
A system that can deliver power to devices without the need for wires has been shown off at a hi-tech conference.
The technique exploits simple physics and can be used to charge a range of electronic devices over many metres.
Eric Giler, chief executive of US firm Witricity, showed mobile phones and televisions charging wirelessly at the TED Global conference in Oxford.
He said the system could replace the miles of expensive power cables and billions of disposable batteries.
"There is something like 40 billion disposable batteries built every year for power that, generally speaking, is used within a few inches or feet of where there is very inexpensive power," he said.
Trillions of dollars, he said, had also been invested building an infrastructure of wires "to get power from where it is created to where it is used."
1. Magnetic coil (Antenna A) is housed in a box and can be set in wall or ceiling.
2. Antenna A, powered by mains, resonates at a specific frequency.
3. Electromagnetic waves transmitted through the air.
4. Second magnetic coil (Antenna B) fitted in laptop/TV etc resonates at same frequency as first coil and absorbs energy.
5. Energy charges the device.
