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?
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
= 18 kWh
One month's consumption of energy by fans
= Power in watt × Number of fans × Number of working hours × Number of days1000
= 24 kWh
Hence, one month's total consumption of energy = 18 + 24 = 42 kWh.