[plug] Anybody know how this thing works?

[Daniel J. Axtens]

On 8/29/06, Michael Holland <myk at myk.id.au> wrote:
> On Tue, 29 Aug 2006, Russell wrote:
>
> > They have one advantage over PCs: the specs for the one above say that
> > its power supply brick produces 12 Volts at 3 Amps, which is
> > substantially less power than an equivalent PC draws.

12V @ 3A : P = EI = 12V * 3A = 36 Watts

Note, however, that 36W is the power the brick puts *out* - if it's is
50% efficient (eg old transformer style), the supply draws 72W, but if
it's 90% efficient (eg modern switchmode) that's ~40W in.

> Draws around 25W idle, 50W max, incl internal 3.5" IDE drive.
> Dead quiet with a new fan and HDD. Perfect for many Linux appliances.

That's power in, not power out - the opposite of the supply above. The
devil is in the detail, as usual :)

Daniel

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