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SOLVED which rheostat??

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Shadow ÒÓ

Mod in Hiding
Joined
Dec 20, 2000
Location
Pensacola, Florida USA
I've heard a number of times that fans (larger ones) generally use around 7 watts. I'd either get the better one on line or have the shack order you a better one.
 

Hoot

Inactive Moderator
Joined
Feb 13, 2001
Location
Twin Cities
To answer your question, the 5W Radio Shack rheostat will work. The fan draws enough current to develop 8W at 12V. You are lowering the voltage to obtain a lower speed/noise. At the lower voltage, the fan will draw less current, thus consuming less wattage. The current rolls off quickly, as does the speed/noise, as you lower the voltage. Use the 10 ohm unit. This would be different if you were, say, using an 18V P.S. and using the rheostat to drop the voltage down to 12V, in order to run the fan.

Hoot
 
OP
L

lightning

Guest
thanks guy....thank for all ur input....
:)