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  • Question

  • Two electric bulbs marked 25W ? 220V and 100W ? 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?


  • Options
  • A. 25 W
  • B. Both
  • C. 100 W
  • D. Neither

  • Correct Answer
  • 25 W 

    Explanation

    Resistances of both the bulbs are

     

    R1=V^2/P1 = 220^2/25

     

    R2 = V^2/P2 = 220^2/100

     

    Hence   R 1 g t   ;   R 2

     

    When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.

    • Tags: AIEEE

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