# Mailinglist Archive: opensuse (3572 mails)

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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:

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

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

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On 2/18/08, Aaron Kulkis <akulkis00@xxxxxxxxxx> wrote:

James Knott wrote:

Ummm... He was talking about RMS, which implies voltage or current.RMS is short for Root-mean-squared

There's no such thing as RMS power.

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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