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Question

Calculate the no. of 'units' of electricity consumed for a month for the following details of electrical components in a household. Consider all the given components are used for 10 hours a day. (Take 1 month = 30 days)

Home Appliance Wattage
6 ceiling fans 60 W each
4 CFLs 15 W each


A
12600
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B
1260
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C
126
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D
12.6
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Solution

The correct option is C 126
Power consumed by one ceiling fan, Pf=60 W
Power consumed by all the 6 ceiling fans:
P1=6Pf
P1=6×60=360 W

Power consumed by one CFL, Pc=15 W
Power consumed by all the 4 CFLs:
P2=4Pc
P2=4×15=60 W

All equipments run for duration, t=10 hr
Total electrical energy consumed in a day:
Ed=t(P1+P2)
Ed=10×(360+60)=4200 Wh
Ed=4.2 kWh=4.2 units

For one month, total units of electrical energy consumed is:
E=30Ed
E=4.2×30=126 units

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