airwinny wrote:

philipvdb wrote:
I'm doing this just because most of the times we take things for granted without testing.
So, if I understand your test correctly, if you trim off the excess leads, the resistance basically stays the same, no matter the number of wraps? In my head that makes perfect sense.

The other half of your drawing, the one with excess leads, makes no sense at all to my limited logic. With excess leads, the resistance increases with the number of wraps? That's such a fun discovery :)
I'll probably never fully understand electricity, but I'd love to read an explanation for that. Very interesting.


Left side shows that only the length between the posts plays a role for resistance. Number of wraps doesnt play a role as long as the length of the wire stays the same.
Right: the coil was placed at the same spot so the lentgh between the posts changed with the number of wraps. More wraps, more wire between the posts since the coil was positioned at the same spot gives higher resistance. Leaving or cutting excess wire after the screws doesnt change the resistance.
So the right read-outs actually confirms the left part which is: only length of wire between posts determines the resistance, number of wraps between the posts or excess wire after posts dont have any influence on the resistance.