What will be the total cost of one day for using a heater of 1000 W for 10 hours and
two bulbs of 100 W each for 15 hours. The cost of one unit is Rs. 7
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An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a month of 28 days, if one unit costs 3.00 rupees? Answer. Power=1000 W = 1 KW Time per day=2 hour Total time= 2 X 28 = 56 hour Energy= power X time = 1 X 56 =56 KWH Now 1 KWH costs Rs 3 Then 56 KWH will cost = 3 X 56 = Rs 168
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