Auto Transformer in Hindi - how Variac works, uses

Auto transformer in Hindi video. How variable autotransformer works, uses, Variac, manual voltage stabilizer explained in Hindi in this video tutorial.
3 phase & single phase variable Auto Transformers, Variac concept, step up transformer, use, advantage disadvantage is explained in Hindi video on electricity and electrical engineering lecture.
Further, Step up, step down, tapped, zigzag auto transformers are explained in transformer tutorial in Hindi.
Educational tutorial 123 by G K Agrawal (Gopal Krishna Agrawal).
The lecture is given by a person with industrial experience and useful for electrical, electronic communication and power electronics engineering students, project work and also Physics students.
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