Firstly, apologies for the electrical question in an electronic group.
I always thought the reason for having to unwind extension cords was to prevent creating an inductive loop (?) and/or increasing the resistance of the wire.
Lately though I have read at least a few times that leaving them coiled up more simply just doesn?t allow the ?heat to escape?.
So is the situation A, B, or A->B?
I guess the practical difference is that B implies that a coil is fine, as long as it?s a somewhat loose coil. So what?s real here?