山西省忻州市第一中学高中物理第二章恒定电流单元复习预习案(无答案)新人教版选修3_1.doc

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1恒定电流【教学目标】1知道电阻的决定因素、焦耳定律和串、并联电路的总电阻与分电阻的关系及电压、电流分配规律。掌握伏安特性曲线的特点及应用。2掌握闭合电路的路端电压、功率、效率、动态分析、含容电路分析。3掌握测量电阻及测量电源电动势和内电阻的各种方法的分析、归纳和提炼,原理和。会使用多用表进行测量。4通过整合本章知识,形成系统知识结构。【预习任务】1本章所学过的所有规律有哪些?2画出滑动变阻器的两种控制电路图,并说明负载上的电压变化范围。3测量电源电动势和内阻的方法有哪些?试画出相应的电路图。4画出改装电流表、电压表和欧姆表的原理图,并说明改装原理。5试总结出测量电阻的各种方法及原理。6电阻和电源的伏安特性曲线各有何特点?如何由 U-I 图象得到关于电阻和电源的2信息?【组内检查】1检查本章所学过的所有规律2画出测电阻时分压外接法的实验电路图

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