You got it.
I plucked the 2A/sq.ft. in the example out of the air; it seems that my subscription to the Online Manual has expired, I didn't know the prescribed current density for copper plating. It was a free subscription, since I use it only to assist Caswell customers, are you reading this Lance or Mike?
Be it a hobby or a business use; if you want to do it right, get used to the math, you're dealing with electrochemistry here. You certainly had no problems doing the (4th. grade) math, and now you know how to do it right.
Its common and sensible practice to use a resistor(s) that are rated for about twice the calculated Wattage, they won't got so blasted hot that way.
BTW, professional CC/CV power supplies will operate down to zero Amps and zero Volts with no problems. They cost about 10X more than the Chinese power supplies, you get what you pay for (as always).
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