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Fourbulbs, each of rating (100 W, 220 V) areconnected in parallel across a voltage supply of 220 V, areoperated for five hours daily. If all the bulbs are replacedby LEDs of rating (8 W, 220 V), How many units ofelectrical energy will be saved every month (30 days)?町7配可死啊祄抢 T (100 W, 220 V)큠1オ 可阿220V,A: 55.2 unjtsC:4.8 unitsB: 160 unitsD: 32 units |
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Answer» Power=100 wtotal hours in 30 days = 5*30=150 hrsenergy= power*timepower= 0.1 kw0.1*150=15power for four bulbs = 4*15= 60 kwnowfor led apply same method power = 8 wtotal hours in 30 days = 150power = 0.008 k/wenergy = power *time=0.008*150=1.2so power for four bulbs = 1.2*4=4.8sow we have to find the energy save so p1-p2 = 60-4.8=55.2 ans |
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