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If a transformer has turns ration K, the primary and secondary currents are I₁ and I₂ respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then
I1=KI2
I1=KI2+Iw
I1=KI2+Iw+Iμ
I1=I2K+Iw+Iμ