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10th Class Science Electricity and Circuits Question Bank 10th CBSE Science Electricity

  • question_answer
      An electric heater is rated at 2 kW. Calculate the cost of using it for 2 hours daily for the month of September, if each unit costs ` 4.00.

    Answer:

                      Electric energy consumed by heater in one day = Power X Time = 2 kWx 2 h= 4 kWh                              (1) Electric energy consumed by heater in one month = 4 X 30 = 120 kWh [ September = 30days] = 120 unit [1 unit = 1 kWh]                          (1) Cost of using the heater = 120 x 4.00 = `                                          (1)


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