Answers

2016-03-16T10:38:59+05:30
Power = energy / time 
  = 500/20 =25W

Energy consumed in 15 days 
= 25 * (2 * 3600) / 15
= 2,700 KJ
  or,
= 25 * 2 /* 15 = 750
= 0.750 kWH 
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