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Transformers Current and Voltage

  1. Apr 30, 2015 #1
    1. The problem statement, all variables and given/known data
    A transformer has a turns ratio of 5 : 1. It is connected to a 230 V supply and an output (secondary) current of 2.7 A is measured. If the transformer is 90% efficient, calculate:
    1. Secondary voltage
    2. Input (primary) current



    2. Relevant equations
    Pout/Pin*100=efficiency



    3. The attempt at a solution
    I dont think it can be solved as most of the equations dealing with transformers assume an ideal transformer.
     
  2. jcsd
  3. Apr 30, 2015 #2
    Hi Xvivi,
    The ratio is 5:1, just to remind that even the tronsformer isn't 100% efficient the output is yet the same, the only thing that changes is the ouput current,
    You can pull out the ouput voltage, use the fact of thethe 90% efficiency to determine the input current, good luck !
     
  4. May 2, 2015 #3

    NascentOxygen

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    Staff: Mentor

    In your analysis here you do include an ideal transformer, then add an external resistance to it to account for its non-ideality.
     
  5. May 2, 2015 #4

    CWatters

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    Science Advisor
    Homework Helper

    Work out the secondary voltage assuming an ideal transformer.
    Work out the output power
    Work out the input power allowing for the efficiency being 90%
    Work out the input current.
     
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