Answer / rahul khurana

In transformer there are tho typw of losses core losses and
copper losses. core losses depends upon voltage and copper
losses depend upon current. there is no windage losses in
transformer whereas in motor it occurs.
so, in conclusion there is no any factor in transformer
which relates with power factor so the rating of
transformer is in KVA instead of KW.

Answer / ganesan

The copper loss of a transformer depends on current and iron
loss depends on voltage.Hence total losses depends on volt
ampere(VA) only and it is independent of load power
factor.That is why the rating of Transformer is given in KVA.

Answer / gms

RATING is given in kw when we have any knowledge about the power factor of the load which is to be connected on the output side.
in case of the transformers we have no information about the power factor of the load so it is evident to define its ratings in terms of (VA)

Answer / athul thilak

there are two losses in transformer.copperloss and iron
loss.these two factors are not affected by power
factor.hence transformer is rated in kva

Answer / aashwin p

Transformer is a show the capacity in Kva
And
Motor KW shows a How much Power Consumtion on it

Answer / prabhakar jha

Transformer wattage is not fixed.motors power is fixed.

Answer / zeyad

when we calculation the power of motor : p= v*i *cos&
but when ------------------------ trans : s= v*i = va
at trans total power maen that : s=p+q
wher: s = total power or apparent power
p= active power( this is the force depent in motion
motor )
q= reactive power( depend in sometime losses)
wehre cos&= real power/apparent
finaly all of above are unit of power

Answer / kirtan

in transformers the output depends upon voltage and ampere
and in motors it depends upon power.

Answer / simza

it is because a transformer uses ac voltage and therefore
the voltage and current are not always in phase whereas a
motor uses dc voltage to produce the turning effect(voltage
and current are always in-phase)

Answer / basheer ahmed

BECAUSE A TRANSFORMER HAS ELECTRIC ENERGY AT INPUT AND
OUTPUT SIDE WHEREAS A MOTOR HAS MECHANICAL ENERGY AT THE
OUTPUT. MECHANICAL ENERGY HAS THE UNIT OF WATTS.

how capacitor control the power factor/

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