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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    What is the minimum number of bulbs, each marked 60 W, 40 V, that can work safely when connected in series with a 240 V mains supply?

    A)  2

    B)  4

    C)  6  

    D)  8

    Correct Answer: C

    Solution :

     In series, voltage gets distributed equally amongst identical resistances Number of bulbs\[=\frac{total\,\,voltage}{rated\,\,voltage\,\,of\,\,each}\]                             \[=\frac{240}{40}=6\]


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