[Bglug] DC Current and Wire Size

[Peter]

There was a brief talk about running DC 12V LED lamps and the required 
wire size.
1) Remember that for DC, the wire length is from source to device AND 
BACK TO SOURCE.
2) There will be many sources on the Internet on this. From my copy of 
Nigel Calder's Boat Owner's Mechanical and Electrical Manual, pages 90 
and 91
for a 10% voltage drop on a 5 ampere load
Wire size    Length in feet from source to device and back to source
18                10
16                40
14                60
12                90
10                140
3) From my limited experience with wiring, I take my estimated wire 
length required to run the wire and then double it to allow for all 
those bends and up walls and down walls. And for DC, possibly double it 
again for the return leg.
YMMV,
Peter Richards

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe. -  Albert Einstein

On 12/04/2015 12:00 PM, group-request at bglug.ca wrote:
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> Message: 1
> Date: Thu, 3 Dec 2015 19:31:36 +0000 (UTC)
> From: William Park <opengeometry at yahoo.ca>
> To: Bruce-Grey Linux Users Group <group at bglug.ca>
> Subject: [Bglug] Using Raspberry Pi to emulate USB keyboard?
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> Following on the recent discussion of $5 Raspberry Pi...
> Do you guys know if it's possible to use Raspberry Pi to emulate USB keyboard?? As far as PC is concerned, it's receiving keypresses from some keyboard, which happens to be RPi faking as keyboard.
> If so, where do I start my reading?