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电学综合计算题是电路分析和电路计算相结合的一类题,因其一题可考查多个知识点,且能考查出各类学生的水平,区分度较高,故成为各省市中考题中的压轴题.这类题知识密度大、灵活性强,也是教学中的难点.下面结合二题,谈一下它的组成和解法.题目1:如图(1)所示,电源电压不变.L_1标有“6V,3W”的字样,L_2标有“8V、8W”的字样.当 S 闭合时,灯 L_1正常发光.求:1.A_1、A_2、
The comprehensive calculation problem of electricity is a combination of circuit analysis and circuit calculation. Because one question can be used to examine multiple knowledge points, and the level of different students can be determined, and the degree of discrimination is high, it has become the subject of examination in various provinces and cities. The final line title. This type of knowledge density and flexibility is also a difficult point in teaching. The following combination of two questions, talk about its composition and solution. Topic 1: As shown in Figure (1), the power supply voltage is unchanged. L_1 is marked with the words “6V, 3W” and L_2 is marked with the words “8V, 8W”. When S is closed, the lamp L_1 emits normally. Find: 1.A_1, A_2,