Question

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).
please give me right answer.
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Answer 1

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.