交流电和人们日常生活、生产有着密切的联系,本文拟选几例归类解析,旨在培养同学们灵活运用所学知识处理实际问题的能力.1变压器原理类图1例1如图1所示是“漏电保护器”关键部分的原理图,其中P是一个变压器的铁芯,入户的2根电线(火线和零线)采用双线绕法,绕在铁芯的一侧作为原 AC is closely related to people’s daily life and production. This paper proposes several examples of classification and analysis, aiming to develop the students’ ability to flexibly apply the learned knowledge to deal with practical problems. 1 Transformer principle Class diagram 1 Example 1 As shown in Figure 1 It is the schematic diagram of the key part of the “earth leakage protector”, in which P is the core of a transformer. The two wires (fire and neutral) entering the house are double-wound and wound around one side of the core as the original.