Robert Monsen
Guest
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 Posted:
Wed Feb 09, 2005 3:12 pm Post subject:
Re: science project help: batteries and heating element |
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maxslomoff@aol.com wrote:
| Quote: | interesting ideas guys.
what about my 30w soldering tool though? i've done some tests with this
and it provides more than enough heat. this identifies how much
electricity this would take. is there no way to provide this amount of
current with rechargeable batteries? what about batteries for an
electric car or drill? it seems to me these devices could provide a few
short bursts of current to heat a coil.
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Power = Voltage^2/Resistance
The resistance is fixed. Thus, since heat = power, you have to have the
same voltage, ie, 120V to get the same heat. This has nothing to do with
the maximum current a battery can supply; without the same voltage, the
current will be limited by that resistance.
--
Regards,
Robert Monsen
"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
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