From: Adrian Tymes (wingcat@pacbell.net)
Date: Thu Mar 06 2003 - 12:05:35 MST
--- Mike Lorrey <mlorrey@yahoo.com> wrote:
> Given such devices currently run on batteries with
> lives of 3 years or
> more, I'd want something that consumes a bit more
> power if it is going
> to help me lose weight.
>
> What I'd like is an implanted PDA in my brain with a
> HUD in one or both
> eyes, a GPS unit, and a cell phone and FM/XM radio
> receiver built into
> my jaw and skull. The antenna would be a meshed
> phased array between
> skull and skin. Having such a broad antenna should
> minimize EM risk.
> The whole setup is voice and blink/point of focus
> controlled.
>
> Total consumption should be around 5 watts.
Data point: as mentioned elsewhere, the RDA for an
adult male is 2200 calories. This is about 9.2
kilojoules, or enough power to run a 5 watt device for
just over half an hour. Say you only run this when
awake, and then only about half the time (with the
rest spent in "sleep mode", with negligible power
requirements, while not actively being used); that's
still 8 hours per day, or about 16 times your RDA of
calories, to run - without accounting for what the
rest of your body needs.
Now, devices that take mere milliwatts are another
story. If the device could convert 100 calories to
energy (after efficiency: for all this calculation
cares, it might be consuming 200, 300, or more
calories of glucose, but the output is equivalent to
100% efficient conversion of 100 calories), that's
about 418 joules. Which is enough to power a 4.8
milliwatt device 24 hours a day, every day. More
conversion would, of course, mean higher power, but
not astronomically higher (without astronomically
higher calorie input).
As I said, miniscule amounts of power...
This archive was generated by hypermail 2.1.5 : Thu Mar 06 2003 - 12:12:49 MST