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Q.

An electric heater of 400 W works for 2 hours. The energy consumed in a day is [[1]] units.


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Detailed Solution

An electric heater of 400 W works for 2  hours. The energy consumed in a day is 0.8 units.
Commercial unit of energy =1 kWh
Given:
Power or heater,P= 400 W
⇒        = 0.4 kW  (as 1 kW=1000 Watt)
Energy, E = Pt
⇒              = 0.4 kW × 2 h 
⇒    E= 0.8 kWh
The energy consumed in units is 0.8.
 
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