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

  • question_answer Some electric bulbs are connected in series across a 220 V supply in a room. If one bulb is fused then remaining bulbs are connected again in series across the same supply. The illumination in the room will                  [J & K CET 2004]

    A)            Increase                                    

    B)            Decrease

    C)            Remains the same                   

    D)            Not continuous

    Correct Answer: A

    Solution :

                       \[P=\frac{{{V}^{2}}}{R}\]  ÞÞ \[P\propto \frac{1}{R}\]     (V - constant) \ When one bulb will fuse out resistance of the series combination will be reduced. Hence from \[{{P}_{Consumed}}\propto \frac{1}{R}\] illumination will increase.


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