Multiple Choice Questions on An incandescent bulb rated as 100 W at 110 V is connected to a 220 V power supply The power that dis........... for UPSC EPFO Exam Preparation

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Multiple Choice Questions

An incandescent bulb rated as 100 W at 110 V is connected to a 220 V power supply The power that dis...........

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    An incandescent bulb rated as 100 W at 110 V is connected to a 220 V power supply. The power that dissipates in the bulb would be :
     
    This questions was previously asked in
    EPFO EO AO 2023
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    50 W

    Incorrect Answer

    100 W

    Incorrect Answer

    200 W

    Incorrect Answer

    400 W

    Correct Answer
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    Explanation:

    - The power dissipated in a resistive load like a bulb is given by the formula P = V2/R. You need to find the resistance (R) first using the rated values.

    - For the 100 W at 110 V bulb, R = 1102/100 = 121 Omega

    - Now connect it to 220 V: P = 2202/121 = 400 W

    - When the voltage is doubled, power dissipation quadruples due to the squared relationship in the formula.

    - Correct Answer: 400 W

    By: Parvesh Mehta
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