An electric bulb of 100 W is used for 4 hrs a day. Calculate the energy consumed by it in a day in joules and Kilowatt hour (unit).
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Answer:
Given,
Power (Wattage) = 100W
Time = 4 hours
Units consumed = (Wattage*Hours)/1000
= (100*4)/1000 kWh
= 400/1000 kWh
= 0.4 kWh
∴ kWh into Joules = 1 kWh = 3.6*10⁶ J
= 0.4 kWh = (3.6*0.4) * 10⁶ J
= 1.44*10⁶ J
I hope this helps.
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