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Re: [opensuse] [OT] How much power does a PC really consume?
  • From: Aaron Kulkis <akulkis00@xxxxxxxxxx>
  • Date: Mon, 18 Feb 2008 04:32:05 -0500
  • Message-id: <47B95095.3010009@xxxxxxxxxx>
Neil wrote:
On 2/18/08, Aaron Kulkis <akulkis00@xxxxxxxxxx> wrote:
James Knott wrote:
Ummm... He was talking about RMS, which implies voltage or current.
There's no such thing as RMS power.
RMS is short for Root-mean-squared
i.e. _______
/ 2
V X

Sqare root (x^2) is only a way of getting the absolute version of x.
To get the actual RMS (normally used version) value of that you'd have
to average that over a full cycle.

That's why there was a bar "_" over the X.

It was there, ... someone's reply seems to have removed it.


RMS can apply to any function vs. time (voltage, current,
power, etc.)

RMS is just as statistical method, which is useful for making
sense of any time-variant function.

The square root of the square of power is just as much related
to power as the square root of the square of voltage is related
to voltage (NOT power).

I learned RMS was the exact calculation of the energy transmitted over
a waveform and could be seen as the average of the sinus after
rectification. The original measurement was measuring the heat of a
resistor, and therefore the power flowing through it.
I could be wrong (actually I'm quite good at that).




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