Figure 23.5.1: A transformer converts a primary alternating voltage, ∆ Vp, to a secondary alternating voltage, ∆ Vs. The magnetic flux produced in one coil is transmitted by an iron core to the secondary coil, where a different voltage is induced, depending on the ratio of the number of windings in each coil. The transformer has two coils.. A Transformer changes the voltage level (or current level) on its input winding to another value on its output winding using a magnetic field. A transformer consists of two electrically isolated coils and operates on Faraday's principal of "mutual induction", in which an EMF is induced in the transformers secondary coil by the magnetic.

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A transformer is a device that connects two electrical circuits through a shared magnetic field. Transformers are used in impedance transformation, voltage level conversion, circuit isolation, conversion between single-ended and differential signal modes, and other applications. 1 The underlying electromagnetic principle is Faraday's Law.. The following notation is used with a magnetic transformer: L1, L2: the self-inductance of the two coils. M: the mutual inductance. k: the coupling factor. k = M √L1L2. Referring to Figure 9.6.1 (e), the voltage transformer ratio is. V2 = nV1. where n is the ratio of the number of secondary to primary windings.