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Question

In a house 3 bulbs of 25w each are used for five hours a day . calculate the units of electricity consumed in 31 days . Also find total expenditure if one unit cost rupees 2.50 .


Solution

Amount of energy produced by 3 bulbs =25×3=75w
=75100=0.075kw
Energy consumed for 1 day = p×t
p=0.75=0.75×5
t =5 hrs =3.75 kh
Energy consumed in 31 days =3.75×31=116.25kwh
Cost of 1 unit =Rs. 250
Cost of 116.25 unit =16.25×2.50 =Rs 290.625
 

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