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1、名师精编优秀教案电阻的测量课题17 3 电阻的测量设计思想本节主要通过探究实验突破教学难点，强化教学重点：首先突出体现学生课堂学习的主体性，教师传授知识的引导性、辅助性；其次，重视教学的每个细节，课堂推进环环相扣，注意激发学生的好奇心和求知欲。学情分析学生已经学习了欧姆定律，有一定的知识储备，但是学生动手能力、综合能力仍然较差。教材分析本节是闭合电路欧姆定律的运用，既具有联系实际的意义，又能培养学生动手操作能力和分析能力。本节的内容是本章知识的总结，教学中应当让学生有足够的运用知识分析和解决问题的机会。学生在初中做过“用电流表、电压表测电阻”的实验，现在，再做“伏安法测电阻”，当然不能仅仅是操
2、作的重复，要考虑电压表和电流表本身电阻给测量结果带来的误差。教学目标知识与技能1知道测量电阻的原理。2会同时使用电压表和电流表测电阻。3理解不同材料的导体电阻的特性。过程与方法1经历设计实验、进行实验、数据处理的过程，了解欧姆定律的应用。2通过学生动手实验，培养学生发现问题、提出问题和解决问题的能力。情感态度与价值观1通过设计实验、连接电路、测量等过程中，获得成功的愉悦。2培养学生严谨的科学态度。3初步建立将科学技术应用于实际的意识。教学重点：能够设计电路图，完成实验测量；了解滑动变阻器在电路中的作用。名师精编优秀教案重点难点难点：伏安法测定值电阻的阻值。教学方法实验法、观察法、讨论法使用器材
3、电源、电流表、电压表、小灯泡、滑动变阻器、开关、导线、定值电阻课时1 课时文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8
4、HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8
5、ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档
6、编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K
7、8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z
8、8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4
9、文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4文档编码:CW7A9A9Q3K8 HF2Z9S10C8Z8 ZP9V5S9G3K4名师精编优秀教案教学过程设计教学环节教师活动学生活动设计意图一、引入新课提问：实验室有一只电阻不明的定值电阻，你有办法知道其阻值吗？思考教师问题，作出推测，回答问题。引入本节课的实验目的。二
10、、探究新知讨论实验原理提问：测量电阻，我们可以依据哪个公式？回答：RIU得到本实验的基本原理，为后面的仪器选取做准备。讨论实验过程设计电路：提问：电路中需要滑动变阻器么？为什么？选用哪个实验电路？设计实验表格：电压 UL/V 电流 IL/A 电阻 RL/讨论实验电路连接：讨论实验步骤：(请一位同学简述实验步骤)思考并回答：需要。1保护电路；2改变被测定值电阻两端电压。选用第二个实验电路。1根据电路图连接实物；2闭合开关，调节滑动变阻器；3读出电流表读数，并记录于表中，同时求出电阻 RL；通过对实验原理及步骤的逐层推进讨论，使学生更好的掌握实验原理及操作的注意事项。A V V A V A 文档编
11、码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R
12、1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4
13、 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文
14、档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O
15、2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2
16、B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C
17、2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2名师精编优秀教案4调节滑动变阻器，分别测出6 组，并求平均值。数据处理观察、思考并回答。让学生体会利用图象处理数据的简便。讨论问题：定值电阻的阻值会不会改变？会，但是变化不明显。引导学生根据电阻的影响因素，进行思考，学会思考与讨论实验误差。实验结论实验结论：(1)定值电
18、阻阻值变化很小，可以忽略；(2)数据略有不同是实验误差造成的；(3)定值电阻阻值不变，通过电阻的电流与两端的电压成正比。思考并记忆总结实验结论。三、巩固练习1用伏安法测电阻的电路中，有关滑动变阻器的作用说法不对的是()A改变待测电阻两端的电压B改变通过待测电阻的电流C保护电路中的电路元件D为了使电表能选用小量程而使测量思考并回答学以致用，加深理解。文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档
19、编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2
20、R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B
21、4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2
22、文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4
23、O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I
24、2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7
25、C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2名师精编优秀教案结果更准确2在用伏安法测电阻的实验中，刚一试触就发现电流表的指针迅速偏转到最大的刻度，发生这种现象的原因可能是()A电流表的正负接线柱接反了B待测电阻的电阻丝断了C线路某处发生了短路D线路某处发生了开路3一段导体两端的电压为3 V，通过导体中的电流为0.1 A，则这段导体的电阻值是多少？若通过它的电流为0.2 A，则加在这段导体两端的电压为多大？四、课堂小结一、基本知识1实验目的、实验原理、器材2测量工具 电流表、电压表二、基本技能会正确连接电路，能正确使用电流表、电压表。三、基本方法：观察法
26、、对比法思考并回答复习本节知识，形成清楚的知识结构。五、知识拓展问题 1：1实验室有一支电阻不明的小灯泡，你有办法知道它的电阻么？(1)你需要哪些器材？(2)怎么计算？(3)你需要什么工具？(4)电路如何设计？(5)实验步骤如何？观察你测到的不同电压和电流下的灯丝电阻，你发现了什么问题？思考并讨论(与测量定值电阻方法类似)、进行实验，处理数据(通过图象)。观察并回答：不同情况下灯丝的电阻不同。在已有知识基础上的拓展。最后提出的两个问题便是这节课的余味，引导学生养成独立思考的习惯。文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1
27、 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4
28、ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档
29、编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2
30、R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B
31、4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2
32、文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4
33、O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2名师精编优秀教案原因是什么呢？介绍白炽灯的工作原理。得到实验结论：(1)灯丝的电阻受温度影响较大；(2)灯越亮，温度越高，电阻值越大。2为什么只有白炽灯经常在开灯一瞬间烧坏？问题 2：伏安法测电阻实验中缺少了电压表，还能测量电阻值吗？怎么设计电路？听取学生的讨论结果并讲解：“曹冲称象”等效替代法。问题 3：伏安法测电阻实验中缺少了电流表，还能测量电阻值吗？怎么设计电路？思考并回
34、答：温度变了。思考并回答：开灯时，灯丝温度比较低，所以电阻比较小，导致电流较大，所以此时灯丝容易烧断。思考讨论并回答。思考讨论并回答。六、布置作业教材：P8182 动手动脑学物理1 4 板 书设 计173 电阻的测量一、实验原理：RIU二、实验电路图文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10
35、V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L
36、7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3
37、U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L
38、10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A
39、5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7
40、Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2名师精编优秀教
41、案三、实验结论1定值电阻阻值变化很小，可以忽略；2数据略有不同是实验误差造成的；3定值电阻阻值不变，通过电阻的电流与两端的电压成正比。文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B
42、4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2
43、文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4
44、O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I
45、2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7
46、C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2文档编码:CR7L10V4O2R1 HW4A5L7I2B4 ZM3Q7Y3U7C2