How does a transformer work?

Reply Wed 4 Mar, 2015 11:04 am
As raprap pointed out, the AC component of input produces current in the secondary(ies). Any DC component present produces resistive heating in the primary as well as contributing to magnetic saturation of the core, which reduces coupling to the secondary(ies), and may cause overheating damage. So it's not a good generalization to say that the DC 'allows the transformer to function'.
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