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The transformer winding is a short circuit to DC. But for AC, the impedance of the

coiled winding and the magnetic coupling to another winding have the same effect

on AC as resistance has in a DC circuit. That's why Transformers don't work with

DC, and are always operated with AC.

Answer

If you are querying why there are no short circuits between individual turns, it is because the windings are insulated not bare.

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