A building has 5 electric bulbs of 100 Watts each, 10 fans of 60 Watts each, 10 tube lights of 40 watts each and one electric iron of 1000 watts. find the number of units used in 30 days if all the appliances are used 4 hours a day. find the expenditure. if the electric rate per unit is 90 Paisa
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Energy consumed by 4 tubelights per day, E
tubelight
=(4)(40)(5)=800 WH
Energy consumed by 3 fans per day, E
fan
=(3)(80)(12)=2880 WH
Energy consumed by television per day, E
TV
=(100)(6)=600 WH
Total energy consumed per day, E=E
tubelight
+E
fan
+E
TV
∴ E=800+2880+600=4280 WH =4.280 KWH per day
Total energy consumed in 30 days, E
T
=30×4.280=128.4 KWH
Cost of electric energy =Rs. 3.00×128.4=Rs. 385.20
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