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12th Class Physics Alternating Current / प्रत्यावर्ती धारा Question Bank MCQ - Alternating Currents

  • question_answer
    For an ideal step-down transformer, the quantity which is constant for both the coils is:

    A) current in the coils   

    B) voltage across the coils

    C) resistance of coils    

    D) power in the coils

    Correct Answer: D

    Solution :

    (d) power in the coils For an ideal step-down transformer, power is constant for both the coils. i.e.,    input power = Output power \[\therefore ={{V}_{p}}{{l}_{p}}={{V}_{s}}{{l}_{s}}\] or \[\frac{{{V}_{p}}}{{{V}_{s}}}=\frac{{{l}_{s}}}{{{l}_{p}}}\]


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