Electricity is an energy source driven by electric energy. 19 The invention and application of electric power in the 1970s set off the second climax of industrialization. It has become one of the three major scientific and technological revolutions in the world since the18th century in human history, and technology has changed people's lives since then.

The second industrial revolution was marked by the widespread use of electricity. As early as 183 1, the British scientist Faraday discovered the electromagnetic induction phenomenon and put forward the theoretical basis of the generator. Based on this discovery, scientists have conducted in-depth exploration and research on electricity since the 1960s and 1970s, and a series of electrical inventions have emerged. 1866 generator made by Siemens, Germany. /kloc-in the 1970s, practical generators came out. During this period, a motor was invented that can convert electrical energy into mechanical energy. Electricity began to be used to drive machines and became a new energy source to supplement and replace steam power. Subsequently, electrical products such as electric lights, trams, electric drills and electric welding sprang up like mushrooms after rain. However, in order to apply electricity to production, we must also solve the problem of long-distance transmission. 1882, Frenchman Depreux discovered the method of long-distance power transmission, and American scientist Edison established the first coal-fired power station in the United States, connecting power lines into a network. Electricity is an excellent and cheap new energy. Its wide application has promoted the rapid development of a series of emerging industries such as power industry and electrical appliance manufacturing. Human history has entered the "electrical age" from "age of steam".