Question

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If a 90 W electric bulb is lighted for 3 hours how much electrical energy is consumed?​

Answer 1

Answer:

Energy Consumed=90W x 2 x 60 x 60 joules = 648000 Joules. For wattHrs, Energy Consumed = 100w x 2hrs = 200Wh.

Answer 2

Energy = Power*time

Energy consumed by 90 W bulb per day = 2∗100 Wh                

                                                                     = 0.2 kWh  

Therefore, the energy consumed in 3 hours = 3*0.2 kWh

                                                                                   = 0.6 kWh

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