George, you said 1,000 feet of 10 gauge cable has 1 amp flowing at 12 volts supply voltage, I assume you also meant 1 ohm total resistance per 1,000 ft. So, base on this info let's do some [...] comes out to .012 (12 milli-volts) volts per foot.1,000 X .012 =1... Login to read more.