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An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the wafer in the kettle boils in 10 minutes. When the other coil is used, the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be (a) 5 min (b) 8 min (c) 4 min (d) 25 min



An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the wafer in the kettle boils in 10 minutes. When the other coil is used, the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be


        (a)    5 min       


(b)    8 min


        (c)    4 min


        (d)    25 min


Grade:11

1 Answers

Hrishant Goswami
343 Points
7 years ago

(b)

        Time

                 

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