Answer Posted / gaurav bhardwaj
Rating is any device,s power capacity..so if u know how much useful power u can get then only it will be in kW..bcz power factor plays role in useful power then we can say that if a transformer has 20kva rating then it will deliver 20,kw at pf=1..Nd as we don't know the load which is to be supplied that's y rating in kva ,as kW=kva*pf
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