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2014-12-23T03:09:16+05:30

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Energy consumed = power * time duration

   Power  = energy consumed / time duration of consumption
               = 500 Joules / 20 seconds
                 = 25 Watts or Joules/sec

   Lamp has a constant power rating.

   energy consumed in 15 days
                   = 25 watts * (2 * 3600 sec) / day * 15  days
                   =  2,700 kilo Joules
               or,
         = 25 watts * 2 hours /day * 15 days = 750  watt hours
         = 0.750 kWH      kilo watt hours


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2014-12-23T12:48:34+05:30
Power=work/time =500j/20s=50/2=25watts  electrical energy consumed=power in watts x time  in hours/1000  =25 x 2 x15/1000 = 750/1000 =0.75 units
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