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Why do we assign transformer's unit in VA and not in watt?

Hey guys,
We all have heard about transformers and we also know that what does it do.Transformers have been created to transfer required voltage at required destination.It works on the principle of mutual induction.There are two types of transformers,one step up and other step down.Step up increases voltage and step down decreases voltage.As its use differs at different situations,so transformers are given units KVA or MVA but not in watt or kilowatt.Because transformers transfer power but they don't consume it.So it is not a load but it is a machine that supplies power to loads.The users of transformers will get to know from its unit that where they should use this according to the voltage required for the particular load.So remember transformers are not loads but they provide power to loads.The load can be house'sTv,Fridge,AC,cooler,Fan etc.Depending upon the type of loads transformers are used.
Thanks...

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