I have been trying to wrap my head around the puzzle that is ampere turns for electromagnets. The convention is that the more amps per turn of wire around a core the stronger the electromagnet. However the more turns you have the more resistance you have which drives down the amps. So if you were to lengthen the core and increase the gauge of the wire, you'd have room for more turns. But the increased turns drives up resistance so your amps are around the same as before but you now have more turns because you increased the length of the core. So hypothetically have you just created a stronger electromagnet without using more power because you're using the same amount of amps but you'd have a higher number of turns?
...confusing
...confusing
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