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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    An electric iron draws 10 amp, an electric toaster draws 5 amp and an electric refrigerator draws 3 amp from and 220 volts service line. The three appliances are connected in parallel. If all the three are operating at the same time, the fuse to be used should be of

    A)  10 amp         

    B)         5 amp

    C)  15 amp                               

    D)  20 amp  

    Correct Answer: D

    Solution :

     The fuse wire is connected in series to the supply, so it should be able to carry the total sum of currents of all the branches connected in parallel.                 \[{{I}_{fuse}}=10+5+3=18\,\,amp\] A wire capable of carrying a minimum of \[18\,\,amp\] or more current can be used.


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