Answer / anil

the ratio between the KVA and kw is known as power factor
KVA is a kilovolt ampher and kw is kilowatt these two are the units used to express the power KWA is an apparant power and KW is an actual power .

Answer / dharmar.c

We r using KVA in transformers for metering purpose..for calculating copper loss we need Ammeter(A),and we need voltmeter(V) for calculating iron and core losses

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