EXCELLENT QUESTION, Im no metallurgist or chemist but here are my thoughts:
Does the "green powder oxidization" inside a bat cable casing have any affect on the current carrying function of the cable. That whats called "patina" spelling????????? Green copper oxide???
Looks to me like the chemical process of oxidation causes the breakdown of some of the copper (you now have less wire circular mils) and converts it to some extent to a conductor (copper oxide) thats likely higher resistance then the pure copper it was before, SO MY BEST GUESS IS THE NET RESULT IS SLIGHTLY MORE RESISTANCE (now less copper in paralell with higher resistance copper oxide) THEN IF IT WAS STILL PURE COPPER
I guess I'm asking whether current travels in the individual wires or does it travel over the surface and what role does the powder play if any?
Sure current travels in the wires and at that low DC frequency "skin effect" is negligible but again it looks like you now have less pure copper as part of it got converted to copper oxide so you have copper in paralell with higher resistance copper oxide SO ID GUESS WIRE THATS PART OXIDIZED has to be more resistive then if it were still pure copper
Hey, this is as much a chemistry and metallurgy question then electrical engineering and IM NOT knowledgeable on EITHER so no warranty but still the above makes sense to me. Less copper and instead some of it now copper oxide just has to be a worse conductor then if all still in the pure copper state??????
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