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A house is fitted with 5 tubes each f 40 W. If all the tubes are lighted for 20 hours and if the cost of electrical unit is Rs. 0.50, the total cost of electricity consumed is:A. Rs. 20B. Rs.4 C. Rs.5 D. Rs. 2 |
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Answer» The electrical power of a single tube in kilowatt = \(\frac{40}{1000}\) = 0.040 kW The electrical power of 5 tubes in kilowatt = 0.2kW Total unit of power consumed = 0.2 × 20 = 4kWh = 4units The cost of electricity consumed = 4 × 0.50 = Rs. 2 |
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