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Some rules of thumb helping you to learn AWG resistance and diameter by head:
The AWG numbering system is logarithmic and works much like calculating with deciBels:
Resistance:
AWG 15 copper is about 10 milliOhm per meter.
Adding 3 to the AWG number doubles the resistance; Subtracting 3 halves.
Adding 10 to the AWG number tenfolds the resistance; Subtracting 10 reduces by a factor 10.
Diameter:
AWG 18 has a solid core diameter of about 1.0 mm.
Adding 6 to the AWG number halves the diameter; Subtracting 6 doubles.
Adding 20 to the AWG number reduces the diameter by a factor of 10; Subtracting 20 tenfolds.
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