Question

An electric heater of 1500 watt is switched on for 10 hours. The electric energy consumed by the heater is

Answer 1

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

Answer 2

Hey

The formula is :

Energy = power consumed × time taken

∴ energy = 1500 W × 10 hr

convert hr into s

i.e 1 hr = 3600 s, 10 hr = 10 × 3600 = 36000 s

1500 × 36000 ⇒ 54000 × 10³ W/s (J)

⇒ 5.4 × 10⁷ J
 


Hope this helps!