... understood in this way: This amount of money is used to cover three kinds of cost, includinginitial investment in research, building, and buying machines, maintenance cost, andadministration ... energy. Wind makes wings ofturbines in wind – farm rotate at a specific speed. It means turbines and the electricity generatorsinside are activated by wind. (Vinamain, 2011)9monitoring electric ... householdequipments, etc. We also need electricity to run computers, fax machines, lights, air conditioners,photocopy machines, printing machines, etc. in any office. Electricity is in need in factories,restaurants,...