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Coil Physical Properties
Frequently Asked Questions
Q: Why is Coil Diameter calculated?
The outer diameter accounts for the cumulative thickness of all winding layers, which affects the average length per turn and total wire length.
Q: How does this estimate resistance?
The calculator uses standard copper resistivity. A smaller wire diameter results in significantly higher resistance (DCR).
Q: What is the "Fill Factor" limit?
Physical winding is never 100% efficient due to air gaps. Aim for a fill factor below 75% to ensure wire fits the bobbin.
Q: Can this handle high-frequency coils?
No. At high frequencies, "Skin Effect" forces current to the wire surface, increasing effective resistance.
Q: Is thermal management critical?
Yes. If your calculated power loss ($I^2R$) is high, ensure the coil has adequate airflow to prevent insulation damage.
