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雷电是常见的自然现象,地球上每秒钟有100次闪电发生,它们经常有巨大的破坏力.如何防止雷电对人类的破坏是摆在我们面前的重要课题. 防雷的基本原理可从电荷和物体的导电性能说起.电荷有正电荷和负电荷两种,电荷间相互作用的规律为同性电荷相互排斥,异性电荷相互吸引.所有物体可分为两大类,一类是导体,内部有大量自由电荷,在电场力作用下可形成电流;另一类是绝缘体,内部没有自由电荷,不能形成电流.空气是绝缘体,不能导电.除非
Lightning is a common natural phenomenon. There are 100 lightning strikes per second on the earth. They often have great destructive power. How to prevent lightning damage to humans is an important issue before us. The basic principle of lightning protection can be from charge The electrical properties of objects and the talking about. There are two kinds of positive charge and negative charge. The law of interaction between the charge is mutual exclusion of same-sex charges, mutual attraction of opposite charges. All objects can be divided into two categories, one is the conductor, the inner There are a large number of free charges, which can be formed by the force of an electric field. The other type is an insulator. There is no free charge inside and no current can be formed. Air is an insulator and cannot conduct electricity. Unless