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EAMCET Medical EAMCET Medical Solved Paper-2008

  • question_answer
    A projector lamp can be used at a maximum voltage of 60 V, its resistance is 20\[\Omega \], the series resistance (in ohms) required to operate the lamp from a 75 V supply is

    A)  2                                                            

    B)  3

    C)   4                                                           

    D)  5

    Correct Answer: D

    Solution :

                     Current flowing through the lamp, \[I=\frac{V}{R}=\frac{60}{20}=3A\] The current in the lamp must remain 3A, when it is operated at 75 V supply. Let R be the resistance connected in series, then \[\frac{75}{20+R}=3\] \[\Rightarrow \]               \[75=60+3R\] or            \[3R=75-60\] or            \[3R=15\] or            \[R=5\Omega \]


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