Can i use a 10watt rheostat to speed control a vantec tornado

Nismo · Jul 5, 2003

Can i use a 10 watt rheostat or should i go with 12.5 watt or 25 watt. What if i use a 5 watt would that work also or will the rheostat burn. I'm planning on hooking up a rheostat soon to control the beast

Btw what is the price range for one of these anyways.

sandman001 · Jul 5, 2003

which tornado?

Nismo · Jul 6, 2003

80mm one

rugbyroy · Jul 6, 2003

You should be able to. I'm pretty sure the 80mm tornado needs 9 watts. Correct me if I'm wrong.

Josebmw · Jul 6, 2003

Yep, 9.1 W
http://vantecusa.com/tornado.html

Fever · Jul 6, 2003

Make sure it's powerful enough.. I burned out 3 of them. They cought on fire...

Nismo · Jul 6, 2003

so ur rheostats caught fire
if thats true thats crazy
btw thanks for the replys

breez · Jul 6, 2003

10W should be enough.

Gautam · Jul 6, 2003

Wattage rating is just about irrelevent in choosing a rheostat. Its resistance rating in ohms is what you're looking for. Just divide the voltage by the amperage rating of the fan together to find the resistance, which for in tornado's case is 12v / .76A = 15.78 ohm. Always use a resistor with a resistance rating less than that of your fan, or else it will burn out. Do your research. A countless many have burnt out their fans and rheostats by not understanding which rheostat they needed. As long as you get a rheostat rated at 15 or less ohms, there's no chance of it catching on fire.

breez · Jul 6, 2003

When a fans voltage is reduced to lower voltage, the amperage of the fan lowers too.

Gautam · Jul 6, 2003

breez said:
When a fans voltage is reduced to lower voltage, the amperage of the fan lowers too.

Your point being what?

breez · Jul 6, 2003

Nothing special. But because of that it's impossible to calculate the voltage reduction caused by some resistor in serial with the fan.

Gautam · Jul 6, 2003

But you can calculate the lowest resistance possible. Maybe you misunderstood my post. I wasn't calculating the voltage reduction caused by the rheostat. I was calculating what resistance a rheostat should be rated at for use with a Tornado.

breez · Jul 6, 2003

I wasn't replying to your post, I just said some info.

Can i use a 10watt rheostat to speed control a vantec tornado

Nismo

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