9th Class Science Work and energy Question Bank 9th CBSE Science Work and energy

  • question_answer
              An electric heater of 1000 W is used for 2 h a day. What is the cost of using it for a month of 28 days, if 1 unit costs Rs. 3.00?

    Answer:

       Energy consumed by heater of 1000 W for 2 h in one day Number of units Energy consumed by heater in 28 days     = 2 x 28 = 56 unit Cost of H unit = `3 Cost of 56 unit = 3 x 56 = `168    


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