Hôm nay, chúng tôi sẽ điện cho cấp và có lẽ chúng ta không nhận ra như thế nào hữu ích phát hiện này đã. Hơi nước là sáng chế đầu tiên thay thế năng lượng gió. Nó sử dụng để lái xe động cơ và đã được truyền thông qua các đường ống và bộ tản nhiệt cho phòng ấm áp. Xăng dầu hỗn hợp với không khí là phát minh ra tiếp theo, và cung cấp năng lượng. Nó phát nổ trong một hình trụ, lái xe một động cơ động cơ. Vượt ra ngoài những đơn giản và trực tiếp sử dụng, những mẫu có khả năng hoạt động không có nhiều.On the other hand, we make use of electricity in thousands of ways. From the powerful voltages that drive our electric trains to the tiny current needed to work a simple calculator, and from the huge electric magnet in steel works that can lift 10 tons to the tiny electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat a huge mass of molten (nóng chảy) metal in a furnace (lò nung), or to boil a jug (bình, lọ) for a cup of coffee. Other than atomic energy, which has not as yet been harnessed (khai thác) to the full, electricity is the greatest power in the world. It is flexible, and so adaptable for any task for which it is wanted. It travels so easily and with incredible speed along wires or conductors that it can be supplied instantly over vast distances. To generate electricity, huge turbines or generators must be turned. In Australia they use coal or water to drive this machinery. When dams are built, falling water is used to drive the turbines without polluting the atmosphere with smoke from coal. Atomic power is used in several countries but there is always the fear of an accident. A tragedy once occurred at Chernobyl, in Ukraine, at an atomic power plant used to make electricity. The reactor leaked, which caused many deaths through radiation.Now scientists are examining new ways of creating electricity without harmful effects to the environment. They may harness the tides as they flow in and out of bays. Most importantly, they hope to trap sunlight more efficiently. We do use solar heaters for swimming pools but as yet improvement in the capacity of the solar cells to create more current is necessary. When this happens, electric cars will be viable and the world will rid itself of the toxic gases given off by trucks and cars that burn fossil fuels.
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