Question 18:
In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours everyday. Calculate the electric energy consumed in 30 days.
Lakhmir Singh Physics Class 10
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total energy consumed = energy consumed by 60w bulbs+energy consumed by 100w bulbs
=2*60*4*30+3*100*5*30 = 1440+4500 = 5940watt hr = 5.94kwh = 5.94 units
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