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电的现象发现很早,但直到19世纪以后,电才逐渐应用于生产实际。进入20世纪以来,电的利用和电气技术的发展则是一日千里。目前,电已成为世界各国的主要能源,不仅在工厂里广泛利用电作动力,而且在人们的日常生活中,诸如照明灯、电风扇、洗衣机、收录机和电冰箱等,都离不开电。电给人类社会带来了繁荣和发展。
The phenomenon of electricity was discovered very early, but it was not until the 19th century that electricity was gradually applied to production. Since the 20th century, the utilization of electricity and the development of electrical technology have been developing rapidly. At present, electricity has become the main source of energy in many countries in the world. It not only makes extensive use of electric power in the factories, but also can not be separated from the daily life of people, such as lights, electric fans, washing machines, tape recorders and refrigerators. Electricity has brought prosperity and development to human society.