Jim ??Without going back I believe ?WAS ?talking about Halden's measurements of the HT-37 power transformer

A question for you:

If a transformer has about 240 turns of wire in the primary which amounts to perhaps 5 ohms of resistance, how much current will it draw when connected to 120 volts, 60 cycles with all secondaries open circuit?? ?

JIM absolutely no idea unless at least you say what voltage it was designed for. Assuming it was designed for 120/60Hz we still don’t know. It all depends on the core steel itself ?and the physical sizes. Given the same steel? and sizes of laminations ?it now ?depends on how many laminations and ?how hard they decide to push the steel up the B-H curve [ not too too much saturation] at designed voltage. ?The ohms ?have little to do with it until the transformer is loaded.? It seems to me if you reduce the turns, you have to increase the core X-C area etc etc.. but if you make a desirable transformer the magnetizing current will be less than say 30% but that is loose. Since 1870’s the DOE mandated lower more efficient transformers [ for really big transformers] so core loss became critical and they finally started ?research etc and making high cost Grain oriented electrical Steel which? so now maybe all new transformers are more efficient than before.

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If it were connected to DC, the current would be perhaps 24 amps but when connected to 60 cycles AC, what would you expect the primary winding current to be and why? On DC ?input, ?normal transformers are useless, they go straight into saturation. like what happens during Goemagnetic storms and long lines between transformers, I think the rest is up above.? If I understand your questions. Getting late so my wording might be off, typoes too. Hope that this is readable