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Question

In a house 5 CF lamps each of 24 W works for a period of 5 hours and 2 fans of 80 W for 5 hours. What is the electric consumption in kWh for a month?


A

18 kWh

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B

24 kWh

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C

42 kWh

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D

60 kWh

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Solution

The correct option is A

42 kWh


Given: Number of CFL lamps = 5, time = 5 hours and Power of CFL (P) = 24 W
Also, number of fans = 2, time = 5 hours and power of fans = 80 W

One month's consumption of energy by CFL
= Power in watt × Number of CFL × Number of working hours × Number of days1000
= 24×5×5×301000
= 18 kWh

One month's consumption of energy by fans
= Power in watt × Number of fans × Number of working hours × Number of days1000
= 80×2×5×301000
= 24 kWh

Hence, one month's total consumption of energy = 18 + 24 = 42 kWh.


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