Re: Green Apple Small Carbon

[John <zzzjoki@yahoo.com>]

On May 26, 1:23 pm, "Charlie" <charlieD...@verEYEzon.net> wrote:
> "Michael J. Mahon" <mjma...@aol.com> wrote in messagegJmdnc-iUNiSFMXbnZ2dnUVZ_qWvnZ2d@comcast.com">news:gJmdnc-iUNiSFMXbnZ2dnUVZ_qWvnZ2d@comcast.com...
>
>
>
> > Charlie wrote:
> >> "Michael J. Mahon" <mjma...@aol.com> wrote in message
> >>EO2dnbf-V-o4B8rbnZ2dnUVZ_h2pnZ2d@comcast.com">news:EO2dnbf-V-o4B8rbnZ2dnUVZ_h2pnZ2d@comcast.com...
>
> >>>mspangler wrote:
>
> >>>>To figure out how long my data collection Apple II would run on its
> >>>>UPS, I put a Kill-a-watt meter on it. It pulls 24 VA (not counting the
> >>>>monitor). My Mac mini (dual core 1.66 GHz) pulls 28 VA if the optical
> >>>>drive is not running. So you're not necessarily as much greener as you
> >>>>may think.
>
> >>>I just got one of those yesterday!
>
> >>>Did you look at the power consumption (not allowing for power factor)?
> >>>(After all, the Apple II power supply was *way* before power factor
> >>>correction.  ;-)
>
> >> Do any computer power supplies sold in the United States have power
> >> factor correction?  I believe they are standard in Europe but I'm not
> >> sure about the US.
>
> > Europe was quicker to lower the power levels requiring PFC than the US,
> > but progress up the learning curve for PFC supplies, higher integration
> > levels, and the economies of making "global" power supplies are pushing
> > PFC into more power supplies every day.
>
> > Higher powered supplies will be the first to go to PFC, of course.
>
> Thanks Michael.  After posting I did a quick look on the net (should have
> done that first) and found several PFC supplies marketed in the US.
>
> >> Also, in another newsgroup a poster argued that the Kill-a-watt meter
> >> isn't accurate when used with a computer due to the switching power
> >> supply.  He claimed that the Kill-a-watt meter needed a true sine wave
> >> for accuracy and that the switching power supply warped the normal AC
> >> sine wave.  I have no idea as to the validity of that argument but
> >> figured you would be the guy to ask.
>
> > I don't know the circuit of the Kill-a-Watt, but, since it makes a
> > distinction between watts and VA, and clearly is controlled by a
> > microprocessor, it is not unreasonable that it computes using the
> > actual sampled waveforms for current (if not voltage, which is almost
> > always sinusoidal unless it's locally produced by an inverter).
>
> > It would be possible to so some experiments to find out, but probably
> > easier to try to find documentation on the design.
>
> Yes if I recall correctly there was a discussion along those lines in the
> other group but no resolution. :-(
> I really want the Kill-a-Watt to work as it seems like it does a lot for a
> very reasonable price.
>
> Charlie

OK. I just went off to Amazon and ordered a P3 4400. I hope that's
what you meant. It looks pretty darn cool. I'll be checking a few
things. Neat.

Anyway, if I understand what was posted, could the power supply itself
in the A2 be the most wasteful component aside from the monitor?