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JEE Main & Advanced AIEEE Solved Paper-2006

  • question_answer
    An electric bulb is rated\[220\text{ }V-100\text{ }W\]The power consumed by it when operated on 110 V will be     AIEEE  Solved  Paper-2006

    A) 75 W                     

    B) 40 W     

    C)        25 W     

    D)        50 W

    Correct Answer: C

    Solution :

    Resistance of electric bulb, \[R=\frac{{{V}^{2}}}{P}\] Where subscripts denote for rated parameters. \[R=\frac{{{(220)}^{2}}}{100}\] Power consumed at 110 V, \[{{P}_{consumed}}=\frac{{{V}^{2}}}{R}\] \[\therefore \] \[{{P}_{consumed}}=\frac{{{(110)}^{2}}}{{{(220)}^{2}}/100}=25W\]


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