4 ms·
> "Don't worry about getting zapped: Hall assures that the magnetic fields used to transfer energy are "perfectly safe" -- in fact, they are the same kind of fi
by tehwalrus 13y ago
> "Don't worry about getting zapped: Hall assures that the magnetic fields used to transfer energy are "perfectly safe" -- in fact, they are the same kind of fields used in Wi-Fi routers."
LOL. power transmitted by a Wifi router ~= mW. Power required for, even a low energy light bulb ~= 10W. The current draw in modern homes is so big that EM transmission, especially at sensitive wavelengths like microwaves, is highly likely to cook things (and people).
They may well have found a real way to make it work. But saying "it's the same as wifi" shouldn't convince anyone.
- squintychino 13y agoThe common type of bulbs in a few years will be led lights. How much power does an led light bulb draw? Certainly less than 10W I'm guessing.
- dharma1 13y agotypically 4-10W (home use)
- ChuckMcM 13y agoTrue, but its remarkable how constant the amount of electricity the 'typical' home draws, even as the things in it draw less. Things like the TV went from several hundred watts to only a couple of hundred, and then we added a home computer. I agree with the grandparent that you're not going to send a few kW of power into a house like this. The other aspect that wireless power folks face is that any conductor now has a much more serious voltage potential on it. This can cause weird things to happen when dissimilar metals are suddenly energized. Electro transport can cause otherwise strong welds/connections to vanish.
- nickloewen 13y agoUnfortunately, that was the LED lightbulb wattage. http://www.homedepot.ca/product/9-watt-60w-daylight-led-light-bulb-1-pack/827149 http://www.homedepot.ca/product/9-watt-60w-daylight-led-ligh...
- mnem 13y agoIt appears to be around 10W for and LED equivalent to a 60W incandescent bulb: http://en.wikipedia.org/wiki/LED_lamp#Comparison_to_other_lighting_technologies http://en.wikipedia.org/wiki/LED_lamp#Comparison_to_other_li...
- jjoonathan 13y agoAlso, static magnetic fields are conservative. You can't get energy out of them. The only way to get energy out of a magnetic field is by letting it change, which necessarily creates an electric field. I sympathize with the need to find a way to explain how this could be safe, but they're stretching the truth. I hope it doesn't come back to bite them when somebody puts up a youtube video of cooking eggs on copper foil or something.