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

  • question_answer An electric bulb is rated 220 volt and 100 watt. Power consumed by it when operated on 110 volt is [CPMT 1986; MP PMT 1986, 94; AFMC 2000]

    A)            50 watt                                   

    B)            75 watt

    C)            90 watt                                   

    D)            25 watt

    Correct Answer: D

    Solution :

                       Resistance of the bulb = \[\frac{{{V}^{2}}}{{{P}_{Ratate}}}=\frac{220\times 220}{100}=484\Omega \] When connected with 110 V, the power consumed \[{{P}_{Consumed}}=\frac{{{V}^{2}}}{R}=\frac{110\times 110}{484}=25W\]

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