Transformer rating

Discussion in 'Homework Help' started by etech7, Jun 26, 2015.

  1. etech7

    Thread Starter Member

    Jun 9, 2015
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    0
    Hi there,
    I need an answare.
    I have a transformer. It's rating is 250V, 12-0-12V, 5Amp. So it has two possible power rating. It might be 12x5=60VA or 24x5=120VA. Which rating is correct?
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    3,238
    813
    I think that is with a 24 volt center-tapped secondary, so the VA rating would be 5A x 24V maximum = 120 VA. If your transformer has an E-I core and weighs near 2.55 pounds (1.2 kg for the "civilised world :) or about 1.5 kg for a toroid, then I would take that as confirmation.
     
  3. etech7

    Thread Starter Member

    Jun 9, 2015
    33
    0
    yap! it is 24v with center-tapped. it is built with E-I core also. Dimension is 68x45x58 mm². i m not sure about weight. it may b arround 1kilo. here i upload a pic of it.
     
  4. DickCappels

    Moderator

    Aug 21, 2008
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    Then I guess we know what it is now.
     
  5. etech7

    Thread Starter Member

    Jun 9, 2015
    33
    0
    any guess about it's va rating?
     
  6. DickCappels

    Moderator

    Aug 21, 2008
    3,238
    813
    For its type of construction the weight is consistent with your calculation for 120 VA.
     
    etech7 likes this.
  7. etech7

    Thread Starter Member

    Jun 9, 2015
    33
    0
    Ow... so, it is possibly a 120va transfomer. thank you for your kind help. :)
     
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