Question

An electric heater of 1500 watt is switched on for 10 hours. The electric energy consumed by the heater is A) 5.4 10^7 J × B) 3.6 10^7 J × C) 1.8 10^7 J × D) 0.9 10^7 J

Answer 1

10 hour = 10 × 60 × 60 seconds = 36 × 10³ seconds

Energy = Power × Time
= 1500 Watt × 36 × 10³ seconds
= 54000 × 10³ J
= 5.4 × 10⁷ J

Electric energy consumed by heater is 5.4 × 10⁷ J
(A) is the correct option.

Answer 2

Hi !
Option (A) is correct 
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Time = t = 10 hour  = 36000 sec

Power = 1500 W

Energy = Power × Time
            = 1500  × 36000
           = 54000 × 10³ W/s
          = 5.4 × 10⁷ W/s
         = 5.4 × 10⁷ J

Electric energy consumed by  the heater = 5.4 × 10⁷ J