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post #81 of 85
I'd be far more concerned about the resistance of the USB jack itself than the wire gauge...
    
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post #82 of 85
Quote:
Originally Posted by i_hax;14572583 
I'd be far more concerned about the resistance of the USB jack itself than the wire gauge...

NotSureIfSerious1.jpg

The jack is made out of pretty thick and very wide metal and the distance travelled by electricity through it is extremely short. This will cause only a tiny amount of resistance and really has no bearing on the overall resistance of the cord and jack assembly. Where resistance becomes a factor (and problem) is when you send power through comparitively long distances through small conductors, like the tiny wires in a USB cable.
    
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post #83 of 85
Quote:
Originally Posted by Jagged_Steel;14578117 

The jack is made out of pretty thick and very wide metal and the distance travelled by electricity through it is extremely short.

Yes, the jack/socket itself is sturdy, but the housing doesn't carry any electricity. I'm wondering about the electrical contacts themselves.

pinoutUSB.jpg

Those tiny four contacts is all you have to work with - I just don't see 8A @ 12V playing well with that. Especially when you consider used/abused ports like those found on public computers... it would have to use a higher voltage (like PoE).
    
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post #84 of 85
Those USB mini-refrigerators and shavers should work a lot better now. wink.gif

USB-MINI-FRIDGE-3.jpg
post #85 of 85
Quote:
Originally Posted by i_hax;14579033 
Yes, the jack/socket itself is sturdy, but the housing doesn't carry any electricity. I'm wondering about the electrical contacts themselves.

pinoutUSB.jpg

Those tiny four contacts is all you have to work with - I just don't see 8A @ 12V playing well with that. Especially when you consider used/abused ports like those found on public computers... it would have to use a higher voltage (like PoE).

I think there could perhaps be issues relating to arcing or that sort of thing in relation to the plug but these contacts are very short items and are definitelely made of a lot more robust metal than the gossamer like wires in a USB cable. If there is going to be resistance problems it will manifest in the cord which is hundreds of times longer and many times thinner than the contacts.
    
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