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Hello everyone, in this video we are showing how to connect the primary of a three or four-wire transformer. A transformer is a device designed to modify the levels of voltage and electrical current, maintaining practically constant electrical power, from one circuit to another, also modifying the values of the electrical impedances of an electrical circuit. Invented in 1831 by Michael Faraday, transformers are devices that work through the induction of current according to the principles of electromagnetism, that is, it works based on the electromagnetic principles of the Faraday-Neumann-Lenz Law and Lenz's Law, which states that it is possible to create an electric current in a circuit once it is subjected to a variable magnetic field, and it is because this variation in magnetic flux is necessary that transformers only work with alternating current. SUBSCRIBE to our channel and share our work so that we can continue to bring this information that can always be useful to someone. Thank you very much and hugs.