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Question

When a 0.5 kW heater operates for 20 minutes, the electrical energy consumed is equal to ___kJ.


  1. 200 kJ

  2. 400 kJ

  3. 600 kJ

  4. 800 kJ


Solution

The correct option is C

600 kJ


Given,
Power, P=0.5 kW=500 W
Time, t=20 min=1200 s
Electrical energy consumed in a given time, H=P×t=500 W×1200 s=600000 J=600 kJ
Hence, energy consumed is equal to 600 kJ.

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