Question: A single - phase, 4 8 0 VA , 1 2 0 / 2 0 8 V , 6 0 - Hz , transformer is

A single-phase, 480 VA,120/208 V,60-Hz, transformer is supplying rated power at unity power factor. Under this operating condition, the transformers core loss is 10 W, and its copper loss is 50 W. If the transformer supplies only 80% of the rated load, then the core loss will be

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