question_answer

  Four tubelight of 60 W each, three fans of 60 W each and a geyser of 500 W operates for eight hours everyday in a household. The electricity bill of September made Mr. Praveen worried. He discovered the usage of geyser, unnecessary longer. He conveyed to the family members that energy guzzling appliances and gadget ought to be wisely used according to the need. Read the above passage and answer the following questions (a)Calculate the total electrical units of energy consumed in the month of September. (b) Comment upon the values demonstrated by Mr. Praveen. (c) Convert 1 kilowatt hour into joules.

Answer:

   (a) As energy = power x time = [(60 x 4 + 60 x 3 + 500) x 8] = 7.360 kWh = 7.360 x 30 =220.8 units [Number of days in September = 30 days]     (b) Mr. Praveen demonstrated the values to save energy. (c) = 1000 W x 3600 s = 3600000 =3.6 x106)