You can look at it that way.
It works the same as thick film silk screened on resistors, as was used in old fashioned (70's) hybrid circuits. The measured resistance in inversely proportional to surface area.
I have explained it before like this:
Imagine that the entire anodize layer is composed of a myriad of microscopic resistors, all of the same resistance. When the surface area is large there are more of these resistors; all in parallel, so the measured resistance of the entire area is smaller.
Now imagine the same microscopic resistors, but the surface area is smaller, now there are fewer resistors; again all in parallel, so the resistance measured is larger.
Fewer resistors in parallel yields a higher overall resistance.
|