Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2007

  • question_answer 100 W-220 V bulb is connected to 110 V source. then power consumed is

    A)  25 W                                    

    B)  50 W

    C)  100 W                                  

    D)  200 W

    Correct Answer: A

    Solution :

    Resistance of the bulb, \[(R)=\frac{{{V}^{2}}}{P}\] \[=\frac{220\times 220}{100}=484\Omega \] \[\therefore \] Power consumed by the bulb                 \[P=\frac{V{{'}^{2}}}{R}=\frac{110\times 110}{484}\]                 \[25W\]

adversite


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