Electrical transformer | Wikipedia audio article
Channel: wikipedia tts
Date: 28/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Transformer


00:01:30 1 Principles
00:01:39 1.1 Ideal transformer
00:04:56 1.2 Real transformer
00:05:05 1.2.1 Deviations from ideal transformer
00:07:05 1.2.2 Leakage flux
00:10:10 1.2.3 Equivalent circuit
00:13:06 1.3 Transformer EMF equation
00:15:00 2 Basic transformer parameters
00:15:10 2.1 Polarity
00:16:02 2.2 Effect of frequency
00:19:30 2.3 Energy losses
00:24:52 3 Construction
00:25:01 3.1 Cores
00:26:29 3.1.1 Laminated steel cores
00:29:57 3.1.2 Solid cores
00:30:48 3.1.3 Toroidal cores
00:33:49 3.1.4 Air cores
00:34:45 3.2 Windings
00:37:40 3.3 Cooling
00:42:19 3.4 Insulation
00:44:20 3.5 Bushings
00:44:47 4 Classification parameters
00:46:45 5 Types
00:49:54 6 Applications
00:52:02 7 History
00:52:10 7.1 Discovery of induction
00:53:42 7.2 Induction coils
00:54:52 7.3 First alternating current transformers
00:56:25 7.4 Early series circuit transformer distribution
00:57:55 7.5 Closed-core transformers and parallel power distribution
01:02:56 7.6 Other early transformer designs
01:03:41 8 See also



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SUMMARY
=======
A transformer is a static electrical device that transfers electrical energy between two or more circuits. A varying current in one coil of the transformer produces a varying magnetic flux, which, in turn, induces a varying electromotive force across a second coil wound around the same core.
Electrical energy can be transferred between the two coils, without a metallic connection between the two circuits. Faraday's law of induction discovered in 1831 described the induced voltage effect in any coil due to changing magnetic flux encircled by the coil.
Transformers are used for increasing or decreasing the alternating voltages in electric power applications, and for coupling the stages of signal processing circuits. 
Since the invention of the first constant-potential transformer in 1885, transformers have become essential for the transmission, distribution, and utilization of alternating current electric power. A wide range of transformer designs is encountered in electronic and electric power applications. Transformers range in size from RF transformers less than a cubic centimeter in volume, to units weighing hundreds of tons used to interconnect the power grid.