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A bulb of 60W in a classroom remains switched on for a long time from 9 am to 5 pm due to the negligence of students in the class.a. Calculate in joule the electric energy consumed by the bulb?b. If similar negligence had happened in 3 classrooms, how many units of electric energy would have been wasted?c. List out the different ways that can be adopted to save energy. |
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Answer» a. Energy consumed = 60 x 8 x 60 x 60 = 1,728,000 J = 1728 KJ b. Energy loss = \(\cfrac{60\times 8 \times 3}{1000}\) = 2.4 unit. c. i. Avoid unnecessary use of lights and bulbs. ii. Promote maximum use of natural light and wind. iii. Use energy-efficient electrical appliances. iv. Promote use of LED bulbs instead of filament lamps and CFL. |
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