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Intel Claims an Advance In Wireless Power
Many readers are sending in coverage of a demo at Intel's developer forum of a wirelessly powered 60-watt bulb. The NYTimes gives background on Intel's improvement to the 'wireless resonant energy link' technology pioneered at MIT, where researchers achieved 50% efficiency of power transmitted several meters via magnetic fields. Intel reached 75% efficiency. Now they just have to make those coils a lot smaller.
Tesla wanted to do this on a large scale over a hundred years ago, and was prevented by his investors because there was no way to meter usage. He filed a patent for his concept in 1900. This technology is crippled and extremely late.
-1 Uncomfortable Truth
Magnetic field != radiation. Even a fluctuating magnetic field isn't going to effect humans
As Maxwell showed with his equations, fluctuating magnetic field == radiation, by definition. (And is always associated with a corresponding fluctuating electrical field.)
Your second statement is not always true either. For example, the fluctuating electromagnetic field inside a microwave oven would certainly affect humans.
I think that's one of those "april fools" items... note the availability of it.
DEMETRIUS: Villain, what hast thou done?
AARON: Villain, I have done thy mother.
Shakespeare invents 'your mom'
I can't believe this got modded "Interesting" ... that thinkgeek item was released on April 1 quite a while ago .....
How long ago did Tesla conceive of this, and we're still trying to keep up with the guy?
One little problem: Tesla thought that he would transmit megawatts of power wirelessly over transcontinental distances. The idea, as he conceived it, was and is completely unworkable. (Which helps to explain why he died penniless.)
As to the supposed dangers of strong magnetic fields: Tesla spent his entire adult life around some of the strongest magnetic fields ever generated by man, and he died quietly in his sleep at the age of 87.
This is not a new technology but it is helpful to have refined, although the first use when the technology matures will be short range devices (1-2ft) not long range devices (10-20ft).
Actually it IS a new technology. Anyone who is spouting off bombast about how Tesla came up with this a hundred years ago, or that we've been using this in transformers for years is WRONG. Transformers are not resonant devices and rather rely on the closeness of the windings/core to guide the majority of the field lines to the other winding. As for Tesla's work, he used strictly far field EM radiation, which differs fundamentally from this effect, which uses near-field interactions that tend to "stick" for lack of a better term to the power source unless transferred to another device capable of resonating with it. This is what makes this 2006 discovery so great because it is extremely efficient and doesn't rely on line of sight or broadcasting a huge amount of power so that a device a reasonable distance away can receive the power it needs to operate. According to the 2006 article ( http://www.sciencemag.org/cgi/content/full/317/5834/83 ) the electric fields involved are small too: around 200V/m which is about double Earth's field at ground.
And finally, The human body has little to no magnetic response which is why MRI's don't kill you with their multi-Tesla magnetic fields (the Earth's magnetic field is 0.5 Gauss = 1/20000 T, for reference)
Tesla wasn't a hacker like Edison. He was a visionary, who saw deeply into the inner workings of the universe at an intuitive level. He captured what he saw in the language of math, and created the foundations for the modern electric age almost singlehandedly. The HAARP project in Alaska is based on his work in this field.
If he said it was possible within the laws of physics, personally, I believe him. He was probably the most important man in history.
-1 Uncomfortable Truth
Here: The actual story I was referencing is the last one on this page. I remember it being a "driveway moment" for me -- I got home, and sat in the driveway until the story was over.
(I had trouble w/ streaming -- but I clicked the "pop out" button and there's a download link from there. It's just an MP3)
http://www.studio360.org/episodes/2008/01/25
How Acoustic Guitars Work shows that 120 Hz is in-between B and A#, and 60 Hz is exactly one octave lower than 120 Hz.
Unselfish actions pay back better
Fanatics? No.. realistic. Tesla has been regarded as "The Father of Physics", "The man who invented the twentieth century" and "the patron saint of modern electricity." He's far from being a 'crackpot who got lucky'.
Inventions include:
http://en.wikipedia.org/wiki/Nikola_Tesla
No matter if the 'Tesla fanatics' know much about physics or not, Tesla still was and remains a very rare genius.
Thank you for trolling!
His name was not Julius.
No sig for you!!
You are conceptually misunderstanding the significance of this research. They are using resonant induction. This is a form of induction which has directivity determined by the load's location. Your design had excellent efficiency because the load was extremely close. Using resonant induction, you can have extremely high efficiencies with a significant distance between the source and the load. It does not radiate in unwanted directions--it would probably not erase a floppy because it would not couple to the floppy, it would only couple to the load.
He makes perfect sense. Transmission losses are lower for DC at equivalent Voltage/Current because of inductive losses with AC. Historically this has been offset by the greater transformer losses incurred by DC, but modern equipment means that, for long-distance power lines, HVDC is already more efficient than traditional AC distribution.
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