JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Application of EMI (Motor, Dynamo, Transformer)

  • question_answer
    A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80% the current drawn from the line is  [Kerala PET 2005]

    A)            3 A

    B)            30 A                                         

    C)            0.3 A                                        

    D)            2.4 A

    Correct Answer: A

    Solution :

               \[\eta =\frac{\text{Output}}{\text{Input}}\] Þ \[\frac{80}{100}=\frac{20\times 20}{1000\times {{i}_{l}}}\]


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