中考物理冲刺复习-欧姆定律-专题3-欧姆定律在串并联电路中的应用训练VIP免费

ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.欧姆定律及其应用 １. 欧姆定律的内容： 2. 欧姆定律的公式： U 电压 单位： I 电流 单位： R 电阻 单位： 注意的几个问题：①、使用时三个量要注意同一性和同时性。同一性：欧姆定律中 “I” “U” “R”都是对同一个导体或同一段电路而言的。同时性：三个物理量应是一 个导体或一段电路在同一时刻的数值。②、注意各个量的单位（V、A、Ω）。③、注意公式 和物理意义的不同例 1.试电笔内必须有一支很大的电阻，用来限制通过人体的电流，现有一支试电笔，其中的电阻为 880KΩ，氖管的电 阻和人体的电阻都比这个数值小的多，可以不计。使用时流经人体的电流是多少？解题要求：①、先读题，根据题意画出电路图.在电路图上标明已知量的 符号、数值、未知 量的符号.②、要换算单位的先换算③、要对题目进行 必要分析，利 用欧姆定律的基本公式和变形公式及电压、电阻、电流在串并联电路中的基本关系求解. ④、解题过程中要先写出公式，再代入数据和单位，最后得结果。⑤、每个物理量用规定的字母表示。电阻的串联与并联Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students), and promote the formation of good school spirit with the influence of the league members. All League branches should start with recommending outstanding students as the development objects of the League, take amateur league schools as the basis, conscientiously do a good job in the work of pre-league education, league membership educa...