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The transformer which is smallest in size is and how to
calculate that? The options are
100 KVA, 50 Hz
100 KVa, 100 Hz
100 KVA, 25 Hz
50KVA, 25 HZ
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Answer Posted / wareagle
The transformer equation
E = 4.44(f)(B)(N)(a) where E is the voltage in the winding
either primary or secondary, f is the frequency, B is the
flux density in the core, N are the number of turns on the
winding, and a is the cross area of the core. At higher
frequencies the number of winding turns N is reduced. This
formula follows from the Faraday formula, E = N dθ/dt and θ
= B(a).
This formula is why switching power supplies use a much
higher frequency (thousands of hertz) than 60 hertz, they
use smaller transformers that don't need as much wire as
transformers operating at 60 hertz. See Wikipedia for the
transformer website:
http://en.wikipedia.org/wiki/Transformer
Source(s):
Wikipedia for the transformer equation
100 kva 100 hz
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