中考物理冲刺复习-电流与电压-专题3-带表电路的识别-电阻和变阻器训练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.第三讲带表电路的识别 电阻和变阻器一. 专题：带表电路的识别 1. 方法：去表留值法2.原则（1）去掉电流表，用导线代替之。 （2）电压表可直接去掉。 3.例题例题 1：在下图所示的电路中， L1、 L2均正常发光。请在圆圈内填上电压表或电流表的符号，并标出它们的正负接线柱。(1)(2)(3)例题 2：在右图所示的电路中，①、②、③分别是电流表或电压表。闭合开关S 后，若两个灯泡串联，则电路中 是电流表；若两个灯泡并联，则_______是电流表；若_________是电流表，则会损坏电源和电流表（填相应位置的数字）。若②、③是电流表，①是电压表，则将开关 S 闭合后可以观察到的现象是________________________。二．电阻1.物理意义： 定义： 符号： ；公式： ；单位： 影响导体电阻大小的因素有哪些？ 通过观察什么来推断导线电阻的大小？ 假如要讨论“长度”对“电阻”的影响，你需要实验器材中的导线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 education, League members' vanguard exemplary consciousness education, excellent league members' education, etc. ...