http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/ Engadget Comments for Mojo Mobility's induction charging tech: best thing to happen to discs since Tron http://www.engadget.com/media/feedlogo.gif http://www.engadget.com en-us Copyright 2012 Weblogs, Inc. The contents of this feed are available for non-commercial use only. Blogsmith http://www.blogsmith.com/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 10:28AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 10:37AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 10:32AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 10:33AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:01AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:17AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:22AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 10:32AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 10:34AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 10:35AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 8:33PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/
Isn't that just 2.8 watts? Any EEs here?]]>Nov 13th 2008 10:39AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:05AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:05AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:06AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/The actual power is 2,8 Watt (the power you could use for charging), but the device draws 4 Watt from the electrical company meaning that in the long run, this will be pretty costly if it's on all the time.

70% isn't that good ...]]>Nov 13th 2008 11:08AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:16AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:18AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/You would be GREATLY inaccurate about your figures for copper wire conductivity.

Besides, there's no % figure for copper wire, even if you specify the diameter as you did. It then would have a fixed resistance. But at high voltages or low currents, the power loss within the cable would be insignificant. This is classic Westinghouse versus Edison stuff!

http://en.wikipedia.org/wiki/American_Wire_Gauge

Let's pick 10AWG as you say. That's 3.277Ohms/km. Thus at 1M the resistance would be 3.277mOhms. At 4W (delivered) at 5V (like USB), That would be (4/5*0.003277) or 0.0026216V drop, for a total transmission loss of 0.05%, or an efficiency of 99.95%. Even at 24AWG, the drop loss would only be 28x higher, for a loss of 1.4%, an efficiency of 98.6%.

And of course, at 12V, the power loss would go down by a factor of 5 at both voltages.]]>Nov 13th 2008 11:57AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/that looks more correct, apparently about 2 decimal places off of what i remembered from the text book oh so long ago.]]>Nov 13th 2008 12:19PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:04AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:05AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:04AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:24AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/
Another thing you could do is have desk or desk covers with this built in and then you could have mice and keyboards that are wireless and never need to be recharged. There are so many possibilites that I wish someone would just bring it to the market so I can start doing some DIY stuff.]]>Nov 13th 2008 11:47AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/
This technology has been used by Wacom for twenty years for their batteryless pen input pads.

Smart DIYers have played with this technology for quite some time.

http://www.afrotechmods.com/cheap/arnoldpad/arnoldpad.htm]]>Nov 13th 2008 12:02PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 11:48AMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/
Seems like things are getting better anyways, with many gadgets charging/powering via mini-USB. I love not having to plug my external drives into the wall, and being able to charge my phone, BT headset, PSP, Dualshock 3, etc... all via one type of cable that I have dangling from my computers.]]>Nov 13th 2008 3:27PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 12:11PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 12:26PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/
Tesla's History with it, post about MIT's Project ....

That'd be MUCH cooler and very MUCH the way of the future ... mind you like Psychology advances, it took 100 years to get to even THIS point with MIT's units.]]>Nov 13th 2008 12:45PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 2:55PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/
what a deal.]]>Nov 13th 2008 12:47PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/Nov 13th 2008 2:26PMhttp://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/http://www.engadget.com/2008/11/13/mojo-mobilitys-induction-charging-tech-best-thing-to-happen-to/
http://www1.eere.energy.gov/buildings/appliance_standards/residential/pdfs/bceps_slides.pdf

Also, the output power is max. 4 W which is enough for basically any handset, camera, etc. so charging time is the same as a plugged charger.

The MIT experiment is great if you don't mind a 24" diameter coil and a huge expensive box to drive it. Also, try not to stand in front of it unles you like sticking your head in microwave ovens.
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