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JEE Main & Advanced Physics Alternating Current / प्रत्यावर्ती धारा Question Bank Alternating Current, Voltage and Power

  • question_answer
    An ac supply gives 30 V r.m.s. which passes through a 10\[\Omega \] resistance. The power dissipated in it is      [AMU (Med.) 2001]

    A)            \[90\sqrt{2}\,W\]               

    B)            \[90\,W\]

    C)            \[45\sqrt{2}\,W\]               

    D)            \[45\,W\]

    Correct Answer: B

    Solution :

               \[P=\frac{V_{rms}^{2}}{R}=\frac{{{(30)}^{2}}}{10}=90\ W\]


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