U1 / U2 = N1 / N2 in the transformer. If the coil resistance is considered, what are U1 and U2 Please discuss in U1 and U2

Relationship between input electromotive force and output electromotive force of transformer
E1/E2=N1/N2
Because the coil resistance of ideal transformer can be ignored, the voltage drop on the coil resistance can be ignored
So U1 / U2 = N1 / N2
U1u2 represents the electromotive force minus the partial voltage of the coil resistance. For example, the secondary coil represents the voltage of the consumer

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