Answer Posted / meenakshi

tranformers are rated based on the losses.the two main
losses of a transformer are copper loss n iron loss.copper
loss occurs in transformer whenever it is loaded(full load,
half load or whatever the load may be).thus copper loss
depends on current.but iron loss are constant losses,which
vil always be present no matter the transformer is loaded
or not.thus the total losses of a transformer depends on
volt-ampere n not on the phase angle between them. i.e it
is independent of load power factor.

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