[AT] Tractor wiring

[Spencer Yost]

Resistance is a function of current flow, therefore resistance is twice the
problem at 6 volts than 12 volts if the load is the same and cable must be
bigger to mitigate resistance losses.   I understand resistance is the
biggest reason 12 volts was adopted instead of 6 and 120 volts was settled
on for residential wiring.  120V was a compromise between "higher is
better" and too high is dangerous.

Spencer Yost
Owner, ATIS
Plow the Net!
http://www.atis.net

*********** REPLY SEPARATOR  ***********

On 11/17/2004 at 9:51 PM charlie hill wrote:

>Here is my question on this subject.
>
>Why are battery cables for 6 volt systems heavier than those for 12 volt 
>applications?   Assuming both are powering a starter to turn a similar
>size 
>engine (similar load), why would the 6 volt cable need to be bigger.  It 
>flows more amps but less voltage and should flow roughly the same wattage
>in 
>both applications.
>
>Charlie 
>
>
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