中考物理冲刺复习-电学实验训练VIP专享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.电学实验专题一、常见仪器的使用与读数例 1．如左下图所示的电阻箱的示数为 Ω，如右下图所示，电能表的示数为 kW·h。 例 2、小宣用伏安法测量电阻 R 的阻值时，并联在电阻 R 两端的电压表的示数如图甲所示，与电阻 R 串联的电流表的示数如图乙所示，则电压表的示数为 V，电流表的示数为 A，电阻 R 的阻值为 Ω。 二、一些基本实验例 3、为了验证并联电路的电流特点，小薇设计了如图所示的电路进行实验。 （1）在连接电路时，开关应处于______状态。 （2）小薇先将电流表接在 L1所在的支路，闭合开关后，观察到灯 L2 发光，但灯 L1 不发光，电流表的示数为零，电路可能存在的故障是：_______________（3）排除故障后，她测出了 L1、L2支路和干路上的电流分别为 I1、I2和I，电流表示数如图甲、乙、丙所示，可读出：I1=0.5A，I2=______A， I=______A。根据测量结果，在误差允许范围内你认为 并联电路中干路电流和各支路电流的关系是：______________。（写出关系式即可） 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 exem...