There are two answers to that
question.
Answer no. 1:
There are two types of losses in
the transformer/generator i.e core losses and copper losses (I^2R losses). Core
losses are due to voltages and copper losses are due to current. Therefore if
we rate the transformer in KW etc. We would not be able to accommodate the
losses.
Answer no. 2:
The Power factor and current
drawn from the load is un predictive. Whenever you design a transformer or
generator you Simply cannot design that in Watts because the rating would
continuously change due to varying power factors of the loads attached; and
drawn currents.
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