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✔ Take the Basic Electronics Course ☀ See details ???? http://www.ciatuning.com.br/eletrica/... Hello, I'm ALEX LIMA and in this video I'll be talking about What is a Zener Diode and How it Works in Practice. Zener diode (also known as voltage regulator diode, constant voltage diode, breakdown diode or reverse conduction diode)[1] is an electronic device or component similar to a semiconductor diode, specially designed to work under the reverse conduction regime, that is, above the breakdown voltage of the PN junction.