Answer / vishwas namdev shinde

in transformer there are losses presents which are core and
coper lossess,both of these losses are the function of
ohmic current and ohmic voltage.ultimately output of the
transformeris dependes on these losses which is the
function of volt and ampere and these losses are in 'k'.

Answer / j.....

transformer is the device which convert A.C. current to the
D.C. current .during transformation of A.C. TO D.C. the
mechanism of voltage changes in cosine waves. and during
transformation some losses as (magnetic losses)produced .so
according to ohm's law its rated in volts but in transformer
large capacity voltage passes so it rated in "kva".

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