Subject:
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Re: Rechargeable Battery question.
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 1 Feb 2003 17:40:07 GMT
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Original-From:
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PeterBalch <(PeterBalch@compuserve)stopspammers(.com)>
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Viewed:
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1520 times
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Ken
> > rechargeable battery pacs
> > used in certain electric tooth brushes? They recharge in a cradle,
> they seem to have a coil of wire in the base unit and in the toothbrush,
> and it's basically a transformer.
Any idea what sort of power could be transferred?
Let's pull some imaginary figures out of the air...
A toothbrush might use 500 watt seconds to clean your and your spouse's
teeth and is left to charge for 12 hours. That's a charging rate of about
12mW. An RCX holds, say, 9 watt hours. At 12mW, it would require 4 weeks to
recharge.
Or have I got my figures wrong?
Peter
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