Answers

2015-04-28T17:31:03+05:30
As power is given by=electric energy  /time
time-20min=20×60=1200 sec
electric energy=[power × time]
1200×1200=1440000 J=1440kJ
0
2015-04-28T18:12:03+05:30

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Energy consumed = Power of the gadget/equipment  * time duration used
                         = 1200 W * 20 * 60 sec 
                          = 1440000 Joules
                          = 1, 440 kJ
                         = 1, 440 / 3600  kW-h
                         = 0.40 kWh or units
          
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