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KCET2018PhysicsAlternating Current

A step-up transformer operates on a ( 230 ~V ) line and a load current of ( 2 ~A ). The ratio of primary and secondary windings is ( 1: 25 ). Then the current in the primary is

Options

  1. A( 25 ) A
  2. B( 50 ~A )
  3. C( 15 ~A )
  4. D( 12.5 ~A )

Correct answer

B. ( 50 ~A )

Step-by-step solution

Transformer operates on ( 230 ~V ) line; load current ( =2 ~A ) Ratio of primary and secondary windings, ( N_ P N_ S = 1 25 ) Since, ( N_ s N_ p = I_ p I_ s ) ( I_ p = N_ s N_ p I_ s ) ( I_ p = 25 1 2=50 ) Therefore, current in primary ( =50 ~A )

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