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10th Class Science Sample Paper Sample Paper - 4 Term - 1

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

    Answer:

      Electric energy consumed by heater in one day                                                                                                                                                                         (1) Electric energy consumed by heater in one month    [September = 30 days] = 120 units                  [ 1 unit = 1 kWh]      (1) Cost of using the heater Rs. 480.00                                                                                                                  (1)


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