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The transformer is a kind of static electrical equipment. It is used to turn some AC voltage or current into other one or several kinds of voltage or current with the same frequency. When the alternating current is applied to the primary winding, a varying magnetic flux is produced. Then, under the action of the iron core, a varying electromotive force is induced in the secondary winding. The magnitude of the induced electromotive force is related to the number of primary and secondary windings, i.e., the voltage is proportional to the winding turns. The main function of the transformer is to transmit electric power.
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