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

  • question_answer 3 identical bulbs are connected in series and these together dissipate a power P. If now the bulbs are connected in parallel, then the power dissipated will be        [DPMT 2005]

    A)            \[\frac{P}{3}\]                     

    B)            3P

    C)            9P  

    D)            \[\frac{P}{9}\]

    Correct Answer: C

    Solution :

               When bulbs are connected in series, \[P=\frac{{{V}^{2}}}{{{R}'}}=\frac{{{V}^{2}}}{3R}\] When bulbs are connected in parallel, \[{P}'=\frac{{{V}^{2}}}{{{R}''}}=\frac{{{V}^{2}}\times 3}{R}=3\times 3P=9P.\]

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