[simpits-tech] Throttle / Joystick Pots

[Stig Joergensen]

Thats not a simple question.... but it all boils down to 2 factors, amps
and wire gauge...

as a cobber wire have resistance and the smaller the gauge the bigger
the resistance per feet - and the more amps you are polling though the
wire the voltage will start to drop, but how much is depending on the
resistance in the wire.


We had a lengthy talk about this just before christmas - here is some
points i made:

> -----Original Message-----
> From: Stig Joergensen 
> Sent: 23. december 2002 23:59
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] Resistor for LEDs?
> 
> 
> 
> Further more - the "lightwire" that goes to the panel, must 
> be relative
> thick (eg use a thicker wire than the signal wire) otherwise you will
> also see brightness different depending on how close to the PSU the
> panel is - the reason for this is the amount of current you 
> are drawing
> and even cobber wire have some resistance and the smaller the more
> resistance, hence a bigger voltage drop on the wire itself (u=r*i)
> 
> ex
> 
> 1000 feet of 10 gauge cobber have 1.02 ohm of resistance @ 
> 15a = 15volt
> drop
> 1000 feet of 40 gauge cobber have 1070 ohm of resistance @ 15a =
> 16050volt drop
> 
> so you see, if you need to "transport" 5 volt with 15amp across a
> distance of 300m not even a 10gauge wire is big enough (these are
> extreme - i know - but just so you can see it will make a difference)
> 
> for further info on cobber wire have a look at this :
> http://www.valhallascientific.com/applications/applications-6.shtml
> 





> -----Original Message-----
> From: Joseph Fagner [mailto:crease-guard@attbi.com]
> Sent: 9. marts 2003 07:47
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] Throttle / Joystick Pots
> 
> 
> Since we are on the subject of extending wires, when does one 
> have to start
> worrying about voltage drop across a wire run for powering 
> lamps, leds and
> switches and stuff?
>