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Old 04-17-2008, 06:11 PM   #4
benedums
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Join Date: Jan 2007
Location: Eagan, MN
Posts: 75
Yikes

The Sketch is correct!

20A on 120AC is way different than 20A on 12DC.
A 100 watt light bulb will draw about 0.8 amps on 120AC.
Where as a 100 watt amp will draw about 8 amps on 12DC.

Amps = Watts/Voltage

Copper is copper, so 12AWG domestic wire will have "roughly" the same current caring capability as 12AWG speaker wire...
And as HisSketchiness said the domestic wire will be a lot more rigid than and stranded speaker wire.
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