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Question
In a house there are four bulbs each of 50W and 5 fans each of 60W. If they are used at the rate of 6 hours a day, the electrical energy consumed in a month of 30 days is
In a house there are four bulbs each of 50W and 5 fans each of 60W. If they are used at the rate of 6 hours a day, the electrical energy consumed in a month of 30 days is
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Solution
The correct option is B 57 units
2 bulbs of 50 W= 4*50
= 200 w
energy consumed
for 100 w for 6 hrs = 200*6*3600 =4320000 joules
5 fans of 60W = 2*60 =
120W
energy consumed
for 120 w for 6 hrs = 120*6*3600=2592000 joules
total energy consumed
in one day = 4320000+2592000 = 6912000
= 6912000 /3.6*10^6 =
19 KWh or unit
so unit in 30 days =
1.9*30 = 57 units
2 bulbs of 50 W= 4*50 = 200 w
energy consumed for 100 w for 6 hrs = 200*6*3600 =4320000 joules
5 fans of 60W = 2*60 = 120W
energy consumed for 120 w for 6 hrs = 120*6*3600=2592000 joules
total energy consumed in one day = 4320000+2592000 = 6912000
= 6912000 /3.6*10^6 = 19 KWh or unit
so unit in 30 days = 1.9*30 = 57 units
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