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一、本月知识学习指要１．自然界只存在正、负两种电荷，同种电荷相互推斥，异种电荷相互吸引．摩擦起电和中和现象的实质都是发生了电子的转移．２．弄清验电器的构造和原理、导体导电、绝缘体不导电的原因．３．会分析电路图，能分清通路、断路和短路，会组成串、并联电路．
First, this month’s knowledge study refers to 1. There are only two kinds of positive and negative charges in nature, the same kind of charge repels each other, and heterogeneous charges attract each other. The essence of frictional electrification and neutralization is the transfer of electrons. 2. Find out the structure and principle of the electroscope, the conductor conductivity, and the reason why the insulator does not conduct electricity. 3. Will analyze the circuit diagram, can distinguish the path, open circuit and short circuit, will form a string, parallel circuit.