In reply to Jed Rothwell's message of Tue, 12 Dec 2023 15:53:36 -0500: Hi, [snip] >(Jones said that current density depends on the surface area. That is a >geometry error. Current density is a function of surface area. >It is as if Jones said that mass density varies with volume. Or that joules >per gram of fuel depend on how many grams you have.)
"Current density is a function of surface area." is just another way of saying that current density depends on surface area. Actually whether or not this is true, depends on whether or not one holds the current constant when changing the surface area. Regards, Robin van Spaandonk Buy electric cars and recharge them from solar panels on your roof.
