Almost forgot:
Yes, for electrical calculations the proper parameter is wire section/area in mm² because we are interested in principle in current density (current carrying capacity) and as a secondary parameter wire resistance, but I wind transformers and voice coils, and there, when I order enamelled wire rolls at my supplier, I must ask for specific diameter in mm, that's how it's labelled.
Transformer winding data also is given in mm (diameter), not mm²
As in:
"primary 784 turns, 0.40mm ; secondary 100+100 turns 0.80mm" and so on.
There they are talking diameter.
Yes, for electrical calculations the proper parameter is wire section/area in mm² because we are interested in principle in current density (current carrying capacity) and as a secondary parameter wire resistance, but I wind transformers and voice coils, and there, when I order enamelled wire rolls at my supplier, I must ask for specific diameter in mm, that's how it's labelled.
Transformer winding data also is given in mm (diameter), not mm²
As in:
"primary 784 turns, 0.40mm ; secondary 100+100 turns 0.80mm" and so on.
There they are talking diameter.