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

  • question_answer A 220 volt, 1000 W bulb is connected across a 110 volt mains supply. The power consumed will be             [AIEEE 2003]

    A)            1000 W                                   

    B)            750 W

    C)            500 W                                      

    D)            250 W

    Correct Answer: D

    Solution :

               \[\frac{{{P}_{1}}}{{{P}_{2}}}={{\left( \frac{{{V}_{1}}}{{{V}_{2}}} \right)}^{2}}\]\[\Rightarrow \frac{1000}{{{P}_{2}}}={{\left( \frac{220}{110} \right)}^{2}}=4\]Þ \[{{P}_{2}}=250\,W\]

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