Transformer rating

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

  1. etech7

    Thread Starter New Member

    Jun 9, 2015
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    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
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    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 New Member

    Jun 9, 2015
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    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 New Member

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

    Moderator

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

    Thread Starter New Member

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