JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors Question Bank Heating Effect of Current

  • question_answer Three bulbs of 40 W, 60 W, 100 W are arranged in series with 220 volt supply which bulb has minimum resistance [Pb. PET 2000]

    A)            100 W                                      

    B)            40 W

    C)            60 W                                         

    D)            Equal in all bulbs

    Correct Answer: A

    Solution :

                       \[{{P}_{Rated}}=\frac{V_{Rated}^{2}}{R}\] Þ \[R\propto \frac{1}{{{P}_{Rated}}}\]    (V - constant) So bulb of high power will have less resistance.

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