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太原市 2025~2026 学年第一学期九年级期末学业诊断12题试题解读

  • 2026-02-19 04:44:51
太原市 2025~2026 学年第一学期九年级期末学业诊断12题试题解读

  大家好!我是太原市第二外国语学校教师武建加,今天我从试题分析、考情诊断、中考复习备考方法及策略三个方面对实验与探究题12题进行解读。

一、试题分析:

  本题基于实验探究类情景,考查探究“电流与电阻的关系”,是电学典型实验综合题,兼具基础性、探究性与综合性,既贴合学生的实验操作体验,又还原了物理真实的真实过程。

  本题在知识层面考查伏安法电路连接、电流表的读数、控制变量法应用、电流与电阻关系结论表述、欧姆定律的计算应用;在能力层面考查实物电路连接的实验操作能力、电流表的读数能力、实验数据的图像处理能力,结合串联电路规律与欧姆定律的逻辑推理和计算能力;在素养层面渗透了“设计-操作-数据处理-结论推导”的科学探究素养,基于物理规律推理的科学思维素养,以及实验中控制变量以保证准确性的严谨科学态度。

本题对应的课标要求为:3.4.2 知道电压、电流和电阻。探究电流与电压、电阻的关系,理解欧姆定律。3.4.3 会使用电流表和电压表。3.4.4 探究并了解串联电路中电流、电压的特点。用电流表测量电流、用电压表测量电压是测量类学生必做实验,探究电流与电压、电阻的关系是探究类学生必做实验。

  本题各空的难度与区分度分布合理,(1)实物图补充考查滑动变阻器接线和电压表并联的基础实验操作,难度为易,区分度中等,基础扎实的学生能正确完成,基础薄弱者易因接线柱选择或电压表连接位置出错;2)第一空电流表读数是电学基础技能,难度易,区分度低,绝大多数学生可准确读取0.4A,仅极少数粗心者会因量程、分度值判断失误出错;2)第二空控制电压值需运用欧姆定律U=IR计算,难度中等,区分度中等,掌握欧姆定律的学生能快速算出2.5V,未掌握公式或计算粗心者易出错;3)第一空描点作图为实验数据处理的基础操作,难度易,区分度低,多数学生能按数据完成描点连线;3)第二空实验结论需结合控制变量法归纳规律,难度中等,区分度中等,理解实验原理的学生可得出导体两端电压一定时,通过导体的电流与导体的电阻成反比的结论,不理解控制变量法者难以准确表述;4滑动变阻器最大阻值的计算需综合串联电路分压规律与欧姆定律,难度为难,区分度高,仅逻辑推理与计算能力较强的学生能正确推导,基础薄弱者难以完成,有效区分不同能力层次的学生。

二、考情诊断:

  学生在本题作答中呈现出的典型错误有:

  1.1实物图补充,部分学生出现滑动变阻器接线柱位置不明将导线接在非接线柱位置、连接电压表导线连接遗漏、导线横穿元件表面的情况,体现出基础不扎实;

  2.3)第一空描点做出图像,部分学生出现在描点画线时出现折线连接相邻点、强制连接坐标原点和从坐标轴开始连线的情况,体现出实验数据的图像处理能力欠缺;

  3.3)第二空电流与电阻关系结论表述,部分学生出现不控制变量、自变量与因变量混淆、增加额外限定条件“在串联电路中”、将结论表述为电阻越大电流越小等情况,体现出不理解控制变量法和语言表述能力弱。

三、中考复习备考方法及策略:

  针对以上问题,在中考复习备考中,首先要夯实基础,推动知识灵活迁移,通过构建结构化的知识体系,强化变式训练,并注重知识与实际的联系,确保对基础知识的牢固掌握和灵活运用;其次,要注重过程性知识呈现,夯实学科核心素养,在学习中关注思维过程,加强实验探究能力的培养,并通过积累错题本、学习反思等过程性资料,不断提升科学思维和探究能力;最后,必须规范表达,避免细节失分,在答题时严格规范步骤,使用准确的学科术语,并养成仔细检查的良好习惯,力求在细节上做到完美,杜绝不必要的失分。

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  1. CONNECT:[ UseTime:0.001031s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001640s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000753s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000672s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001353s ]
  6. SELECT * FROM `set` [ RunTime:0.000609s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001443s ]
  8. SELECT * FROM `article` WHERE `id` = 467346 LIMIT 1 [ RunTime:0.000955s ]
  9. UPDATE `article` SET `lasttime` = 1771520036 WHERE `id` = 467346 [ RunTime:0.036428s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003379s ]
  11. SELECT * FROM `article` WHERE `id` < 467346 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001268s ]
  12. SELECT * FROM `article` WHERE `id` > 467346 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001238s ]
  13. SELECT * FROM `article` WHERE `id` < 467346 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003060s ]
  14. SELECT * FROM `article` WHERE `id` < 467346 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001381s ]
  15. SELECT * FROM `article` WHERE `id` < 467346 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002081s ]
0.146775s