Archive of the former Yahoo!Groups mailing list: MOTM

----- Original Message -----
From: <mate_stubb@...>
Here's an easy seat of the pants calculation you can use:
P = V∗I, where P = power consumed, V = voltage, I = current drawn. If
you want to know how much power you are drawing, you would look at
the input side of the power supply, not the output side. That's
because power supplies are not anywhere near 100% efficient, and a
significant percentage of the power drawn gets lost to heat.

So voltage is 120 volts. Without measuring exactly how much current
you are drawing from the wall, you can be sure that your power supply
can't draw more than the fuse allows. My PowerOne supply is close to
twice as powerful as the MOTM-900 (which also uses a PowerOne core).
My supply is supposed to be fused with a 1A fuse, so let's take that
value for argument's sake.

If I was maxing my supply out drawing 1 amp, I'd be drawing about 120
watts. You are probably drawing around 70 watts or less. So it's no
worse than burning a 75W lightbulb.

Please refer to answer behind door # 1:
> The short answer is VERY little. Less than a 150W lightbulb.
Stooge Larry