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Homework Help: The lesson of electric machines and drivers - transformer questions

  1. Jun 14, 2013 #1
    the lesson of electric machines and drivers -- transformer questions

    question: the data of a single phase transformer are as following;
    nominal primary voltage U1n= 230V
    nominal secondary voltage U2m= 12V
    line frequency f= 50 Hz
    apparent power S=50 VA
    loading resistor on secondary side is RL=3ohm
    strayed field self induction coefficient in the simplified equivalent circuit Ls=Ls1+Ls2=0.06 H ?

    winding ratio of transformer N1/N2 ?
    nominal primary current I1n?
    nominal secondary current I2n?
    primary side transformed vaue of the loading resistor R'2?
  2. jcsd
  3. Jun 14, 2013 #2


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    Staff: Mentor

    Welcome to the PF.

    Is this for schoolwork? What reading have you done so far about transformers. The questions you ask above are very basic, and if you have done any reading at all about transformers, you should be able to answer them yourself. :smile:
  4. Jun 17, 2013 #3
    electric machine questions

    yes this is a schoolwork and I still cant solve it, if you can solve it for me I would be appreciate,,
    please help me about that because I will have an exam 2 days later in 19 june

    thanks again
  5. Jun 17, 2013 #4


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    Staff: Mentor

    We do not do your schoolwork for you. Especially schoolwork that is this easy if you will just do your course reading. You can also go to wikipedia.org and search on transformers. The basic information you need is on their main transformer page.
  6. Jun 19, 2013 #5


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    Science Advisor
    Homework Helper
    Gold Member

    Type "winding ratio" into google if your text book doesn't explain it.
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