tranformer formulas not matching actual measurements

Discussion in 'The Projects Forum' started by collegemark01, Jun 27, 2016.

  1. collegemark01

    Thread Starter New Member

    Jun 27, 2016
    1
    0
    hi
    I have been given a problem to solve on transformers.
    using
    Code (Text):
    1.  
    2. Vp = Np = Is
    3. ---  ---  ---
    4. Vs   Ns   Ip
    5.  
    Not being given Np or Ns figures but follow reading:

    Vp 242v
    Ip 0.43a

    AND ASKED TO FIND Vs AND Is
    using formula not even getting close to measured result of
    Vs 12.9v
    Is 5.37a

    Can anyone help?

    email: <SNIP>

    Moderators note : removed email to prevent spammers, used code tags to preserve spaces
     
    Last edited by a moderator: Jun 27, 2016
  2. Papabravo

    Expert

    Feb 24, 2006
    10,142
    1,790
    You're right, the given values and the measurements are at odds. What is you want from us? My best theory is that you don't know what you are doing, and are comparing an AC input (mains) to a DC output, since you did not specify that your measured voltage was VAC(rms). You have the same ambiguity in your current measurements as well.

    One should learn to crawl and walk before trying to run a marathon.
     
    Last edited: Jun 27, 2016
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,797
    1,103
    What load did you have connected to the secondary?
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,142
    1,790
    At least the power out is less than the power in. Had it been the other way, it would have been the first known overunity transformer.
     
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