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I am working on home made electromagnet and I have only volt & Ohms details like 12Volt DC, 24Volt DC & 240V AC and ohms is 80Ω, 100Ω & 120Ω for all for example 12VDC 80 ohms coil, 12VDC 100ohms,24VDC 80Ohms coil...etc.

now i want to know which copper gauge we have to choose to create that magnet coil and how many turns i have to take for proper magnet..

is there any equation to calculate to choose...wire and turns

I want to also know the ampere capacity of that magnet coil.

Thanks you very much..