Re: [opensuse] [OT] How much power does a PC really consume?

Doug McGarrett wrote:
On Thursday 14 February 2008 12:50, Randall R Schulz wrote:

On Thursday 14 February 2008 08:52, Per Jessen wrote:

Carlos E. R. wrote:

...

I'm pretty certain it won't be able to measure any spikes. As for
the type of load, it's almost 99% resistive. I.e. the load doesn't
vary with the phase of the AC.

"Resistive" means the current and the voltage are in phase with each
other.

But I don't see how a transformer primary, which is an inductor, can be
anything _but_ reactive.


...


/Per Jessen, Zürich

Randall Schulz


A transformer literally does what its name implies--it transforms a given
voltage and current into another voltage and current, with virtually no loss.
Therefore, if the output load on a transformer is resistive, then the input
to it is resistive also. The relationship between input voltage and current
to output voltage and current is linear; for example, if the input
is 100 volts at 1 amp, the output could be 10 volts at 10 amps. The
transformer is not absolutely lossless, but it is extremely efficient. In
most cases you can very comfortably put your fingers on a transformer
core and feel only a little warmth.



The transformer appears resistive, only at full (resistive) load. At
anything less than that, there's still some amount of inductance to
limit current and that inductance will cause the current phase shift.


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