Question

Q. 95. A 10 watt bulb, used for 8 hours, consumes 80 watt-hr electricity. If a 40 watt bulb is used for 2 hours, it also consumes 80 watt-hr electricity. It means 40 watt bulb consumes electricity with the speed than that of a 10 watt bulb. © double ® triple © quadruple O five-fold​

Answer 1

Answer:

Energy = Power*time

Energy consumed by 100 W bulb per day = 2∗100 Wh                

                                                                     = 0.2 kWh

Energy consumed by 40 W bulbs per day = 4∗40∗4 Wh

                                                                     = 0.64 kWh

Total energy consumed per day = 0.2 + 0.64 kWh

                                                  = 0.84 kWh  

Therefore, the energy consumed in 30 days = 30∗0.84 kWh

                                                                                   = 25.2 kWh

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Explanation: