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When an AC voltage U1 is applied on the transformer side and the current flowing through the winding is I1, this current will generate alternating magnetic flux in the iron core, causing electromagnetic contact between the winding and the secondary winding. According to the principle of electromagnetic induction, alternating magnetic flux passing through these two windings will induce electromotive force, which is proportional to the number of turns in the winding and the value of the main magnetic flux. The voltage on the side with more turns in the winding is high, while the voltage on the side with less turns in the winding is low. When the secondary side of the transformer is open circuit, When the transformer is unloaded, the voltage at the primary and secondary terminals is directly proportional to the number of turns of the primary and secondary windings, and the transformer serves the purpose of changing voltage. |