TRANSFORMER THEORY TransformersFigure 1 Core-Type TransformerWhen alternating voltage is applied to the primary winding, an alternating current will flow thatwill magnetize the magnetic core, first in one direction and then in the other direction. Thisalternating flux flowing around the entire length of the magnetic circuit induces a voltage in boththe primary and secondary windings. Since both windings are linked by the same flux, thevoltage induced per turn of the primary and secondary windings must be the same value andsame direction. This voltage opposes the voltage applied to the primary winding and is calledcounter-electromotive force (CEMF).ES-13 Page 4 Rev. 0
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