[FoRK] the problem of increasing human energy
Stephen D. Williams <
sdw at lig.net
> on >
Wed Aug 16 06:33:20 PDT 2006
Dave Long wrote:
>> The new Seagate Momentus 160GB 5400RPM 2.5" laptop hard drives use .2
>> watts standby, .8 idle, and 2 watts active.
> By way of comparison, that couple of watts active is about the same
> power draw as a single vacuum tube on standby (just for the heater*,
> not for any switching).
I'm amazed they could do that with only a couple watts. I played with
"Cat's Eye" short wave / AM / FM (maybe) receivers when I was a kid that
my dad had collected (along with upright Victrola's and piles of hard
wax records). I would have guessed at least 10w would be needed.
For Seagate to spin a glass platter at 5400 RPM, seek the head, and
power the electronics at 2w is cool.
> How much quiescent power did a typical centrifugal governor require?
> What about distributor advance? How about other kinds of mechanical
> feedback systems?
> Before Watt and Mead, I'd guess most information processing was done
> with wetware, at the cost of 20 W for switching and 80 W for support.
> * "warm boot" (like "champing at the bit") was once more commonly used
> literally than figuratively.
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Stephen D. Williams 703-724-0118W 703-995-0407Fax 20147-4622 AIM: sdw
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