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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    Ten identical electric bulbs, each rated 220 V, 50 W are used in parallel on 220 V line for 10 hours per day in a month of 30 days. The electric energy consumed in kilo watt hours is

    A)  1500

    B)  15,000

    C)  15

    D)  150  

    Correct Answer: D

    Solution :

     Kilo-watt rating of each bulb\[=\frac{50}{1000}\] Kilo-watt rating of all the bulbs\[=\frac{50}{1000}\times 10=0.5\] Number of units in kWh consumed in one day                 \[=0.5\,\,kW\times 10\]hours \[=5\]units/day Total electrical energy in \[30\]days \[=5\times 30=150\]


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