VA rating?

Discussion in 'Homework Help' started by bonjing, Sep 13, 2009.

  1. bonjing

    Thread Starter Member

    Dec 7, 2008
    12
    0
    hello there...

    I am confused again with this power rating'

    how to determine the VA rating if the core area is 3.81cm * 3.81cm = 14.5161 sq.cm.
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Find the maximum flux the core can conduct. Then find the current which will cause that flux and multiply it by the secondary's voltage (approximation).
     
  3. bonjing

    Thread Starter Member

    Dec 7, 2008
    12
    0
    hello,

    I got this formula:

    VA= (sqrt Power/5.58)2

    but the core area should be in sq. inches and I am using a metric system.

    Where does 5.58 come from?
     
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