What is the difference between a toroidal core transformer and an E-I core transformer?
For a given power rating (or VA rating), the toroid transformer will be lighter. However, I have found that the voltage output of a toroid seems to drop more under load than that of an E-I core transformer with the same power rating. In addition, a toroid seems to draw much more current at turn-on, thus requiring a larger AC line fuse. I tend to believe that weight is an indicator of transformer quality, whether the transformer has a toroid core or an E-I core. The heavier the transformer, the better it is.
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