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In this video we will understand why three phase transformers are rated KVA (Kilo Volt Ampere) and not in KW (Kilo Watt) in Hindi language. It is important and interesting to know, all the electrical loads like electric fan, incandescent lamp, tube light etc. are rated in watt or kilo watt, where as the machines which act as source (transformers and generated) are rated in volt ampere.