Answer / rajendra

given Volatage = 415 volts, capacity on given voltage= 3kw
solution:-

while 415volts ac supplied than capacity of heater is 3kw
therfore 1volt supplied than capacity of heater will 3kw/415
so on380 volat supplied than capacity will be
3ooo*380/415=2.746kw
the anser will be 2.746 kw heater capacity on 380volts

Answer / v

Heater will take more current than it was taking before and
it's losses will increase.However it will give same output
as was giving but with increased lossess and get overheated
soon.

Answer / p brown

Lower the voltage will also lower the heater output and amp
draw.

415/380V 3ph.

92% of heater wattagage

96% heater amp draw

Answer / anil patel

1. Given v= 415v
kw= 3w
formula = w=v*v/R
3000=415*415/R
R=172225/3000
R=57ohm
I=v/R
I=415/57=7.28amp
2. given v=380volt , kw=3
R=380*380/3
R=48.133
I=V/R
=380/48.133
=7.8 amp

Answer / elangkumanan

heater =3.0kw
voltage=415v
heater
capacity=380v

formula
3*1000
=---------------
1.732*380*I*0.85
3000
I =-------------
560

I =5.4A

W =415
-----
5.4

= 76WATA

Why transformer rating in KVA? describe.

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