What is the working principle of the voltage transformer?

When the primary winding of the voltage transformer is added with the AC voltage U1, there is a current I1 in the winding, and an alternating magnetic flux Ï†0 is generated in the iron core, and Ï†0 is twisted with the first and second windings, respectively, and then induced in the first and second windings respectively. E1, E2, because the number of turns of the primary and secondary windings is different, E1=KE2.

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