[aprssig] Re: now, 1.5 Lptops Per Child : power options?
scott at opentrac.org
Mon Dec 31 18:40:13 EST 2007
> One thing you forgot .. when you are generating electricity with a crank
> generator .. you are doing *work*.
Yeah, I learned that as a kid, with an old field telephone dynamo, a
knife switch, and some light bulbs. You can crank like crazy until
someone closes the circuit, and you'd just about break your arm if you
were going fast enough.
> My point is that a windmill or anemometer needs to overcome this
> resistance to generate electricity .. and it is a considerable amount of
> resistance believe me. Unless your windmill or anemometer has 15 or 20
> foot arms .. or you plan on waiting for a hurricane .. I don't think it
> will work.
It doesn't scale down to small sizes well, you're right. I was hoping
it'd be feasible for low-power devices, even if it wasn't very
efficient, but it's not looking good.
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