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Question

How much electrical energy is consumed when a bulb of 40 W is used for 12.5 hours every day for 30 days?


  1. 1000  J

  2. 5.4 X 107 J

  3. 5.4 X 106 J

  4. 3000 J


Solution

The correct option is B

5.4 X 107 J


   40 W = 40 J s-1

   Electrical energy consumed

  = P x t

  = (40) x (60 x 60 x 12.5 x 30)   J

  = 5,40,00,000 J

  = 5.4 X 107 J

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