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An electric lamp is marked 100W, 220 V. It is used for 4 hrs daily. Calculate: (i) current passing through it (ii) Bill generated for a week if each unit is rated at Rs.4 (show the steps too) |
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Answer» Answer: Electric LAMP, Power = 100W Potential Difference = 220V ∴ Power = Potential Difference*Current = 100 = 220*Current = 0.45 A = Current Unit consumed for a DAY = (wattage*hours)/1000 = (100*4)/1000 kWh = 0.4 kWh Unit consumed for a WEEK = (0.4*7) kWh = 2.8 kWh If 1 kWh is rated Rs. 4, 2.8 kWh will be rated as = Rs. (2.8*4) = Rs. 11.2 Hope this helps. |
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