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Unread 08-05-2008, 11:25
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Re: witricity legality?

Quote:
Originally Posted by Al Skierkiewicz View Post
Daniel,
One small correction, we are talking about electromagnetic energy in a certain frequency band.
You are correct.

I don't generally differentiate between electromagnetic energy and electrcity because any movement of electricity within a medium creates a magnetic field (so for me it's an assumed thing).

Again, you are correct.
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Unread 10-05-2008, 00:37
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Re: witricity legality?

I havnt looked into this one bit, but does any one know where the power loss comes from?

After a quick wiki search...

It seems as if this technology is similar to transformers. either steup up or step down, so if the coils were identical, then theres no ups or downs but a direct transfer of energy via electromagnetic field. So...this makes me think that the 40% efficiency @ 7feet away conducted by MIT could have been more efficient if the two coils were close to one another....similar to a transformer. Is the high frequency necessary? I can feel the 60Hz "buzz" from my desk lamp if I put a metal object close to the base of the lamp. It doesnt seem to be affecting anything.....I will try a simple coil test right after I publish my post, Ill repost with the results form my Mastercraft Multimeter.


BRB!
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Unread 10-05-2008, 00:55
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Re: witricity legality?

Okay, so I see why they dropped the Witricity. As far as I can see, I didnt get any voltage, but I did get some current, 130mA was the average. As soon as I moved about 2cm awway I was down to only 20ma....Not a very good power supply... thats the end of that..
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Unread 10-05-2008, 07:58
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Re: witricity legality?

Quote:
Originally Posted by Generalx5 View Post
I havnt looked into this one bit, but does any one know where the power loss comes from?
BRB!
June,
There are a variety of places where the power is lost. Turning RF into an effective field is tough enough but then you add to that the power that is lost by not coupling all of that field to the receiving coil. The inefficient coupling between the coils due to a lack of focus of the field and the varying load on the receiving coil all add up as well. Certainly placing the coils closer together would help. The RF is used to make the coils small and light enough to be a practical demo. Lower frequencies would work but the coils become significantly larger for the same efficiency.
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