Electro Magnetic Induction And Alternating Currents Question 218

Question: A step up transformer operates on a 230 V line and supplies a current of 2 ampere. The ratio of primary and secondary winding is 1:25. The current in primary is

Options:

A) 25 A

B) 50 A

C) 15 A

D) 12.5 A

Show Answer

Answer:

Correct Answer: B

Solution:

  • $ \frac{n_{p}}{n_{s}}=\frac{E_{p}}{E_{s}}=\frac{1}{25} $
    $ \therefore E_{s}=25E_{p} $

    But $ E_{s}I_{s}=E_{p}I_{p}\Rightarrow \frac{E_{S}\times I_{S}}{E_{p}}\Rightarrow I_{p}=50A $



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