Transformer
Definition: An electro-magnetic device used to change the voltage in an alternating current electrical circuit.
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Transformer – Wikipedia
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What is a Transformer? An Electrical Transformer Tutorial
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Transformers - Electric Power transmission
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IV.A.7. Three Phase Transformer Connections from Single Phase - NCEES Electrical Power PE Exam
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Electrical transformers for beginners: from fizzics.org
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Basics of Electrical Transformers | How Transformers Work & How You Test Them