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

  • question_answer
    In an ac circuit with voltage V and current I, the power dissipated is                                         [CBSE PMT 1997]

    A)            VI

    B)            \[\frac{1}{2}VI\]

    C)            \[\frac{1}{\sqrt{2}}VI\]

    D)            Depends on the phase between V and I

    Correct Answer: D

    Solution :

               \[\because P=Vi\cos \varphi ,\]\[\therefore P\propto \cos \varphi \]


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