I'm checking to see how much energy my fan uses in a span of two hours.

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"Last night I tried to slip it in her rear. When she began to
complain about the pain, I stupidly told her to take it like a man."

~Quantumleaper

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It depends how it's driven - it's not always linear

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I know. I'm not too well experienced in Physics. I took pre-AP physics in high school. No one understood the material at all, and we all got by on curved grades. I always set the curve because I had the highest grade. To come back from that tangent, I didn't learn everything I needed to in Physics.


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"Last night I tried to slip it in her rear. When she began to
complain about the pain, I stupidly told her to take it like a man."

~Quantumleaper

The simplest way though would be to purchase a plug in power meter and just compare the readings on various speeds.

Post edited at 7:30 pm on June 6, 2012 by 8086

When it comes to fans, especially ones designed to run at a few fixed speeds, they're a lot like boat propellers in that they have practically no load, and the load doesn't change--so there's never a need for any significant quantity of torque (coincidentally, this is why boat engines never have torque ratings, because it matters exactly zero).

Since the load is hardly changing, you really shouldn't have a huge change of power. Remember that the only force you really have to overcome is friction, so if the fan has good bearings then it really doesn't take that much power to make it spin.

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Und ihr wisst, was es ist

I don't know though.