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Old 22nd Jul 2021, 7:43 pm   #15
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 6,029
Default Re: What is a reasonable magnetising current for a mains transformer?

Yes - the table Joe included in his post (#5) gives resistivities and conductivities. I picked on the resistivities because that's what I use routinely - but one is the reciprocal of the other, so if ratio of resistivities is 1.6 : 1, the ratio of conductivities is 1 : 1.6.

I'm struggling to see how to derive Joe's 5 : 1 though, even the resistivity-density product doesn't give a ratio of 5... between Cu and Al.
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