Q. 7

In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours every day. Calculate the electric energy consumed in 30 days.

Answer :

When two electric bulb of 60W are lighted for 4 hours then

Here, p1 = 60w


Number, n1 = 2


Time for daily use, t1 = 4h


Total electrical consumed everyday, E1 = n1×p1×t1


= 2×60×4 = 480


Energy consumed in 30 days = 30×0.48 = 14.4Kwh (As 1kW=1000W)


When three electric bulb of 100W are lighted for 5 hours then


Here, p2 = 100w


Number, n2 = 3


Time for daily use, t2 = 5h


Total electrical consumed every day, E1 = n2×p2×t2


= 3×100×5 = 1500


Energy consumed in 30 days = 30× 1.5 = 45Kwh (As 1kW= 1000 W)


Total electrical consumed in 30 days = 14.4Kwh + 45Kwh = 59.4 kWh

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