2022年2018学年高中物理人教版选修31学案：2.3欧姆定律Word版含答案 .pdf
名师精编优秀教案3 欧姆定律学习目标1.进一步体会用比值定义物理量的方法,知道什么是电阻以及电阻的单位.2.理解并掌握欧姆定律,并能用来解决有关电路的问题.3.通过测绘小灯泡伏安特性曲线的实验,掌握用分压电路改变电压的基本技能.4.知道伏安特性曲线、线性元件和非线性元件,学会一般元件伏安特性曲线的测绘方法.自主探究一、探究导体中的电流规律对同一导体,电流跟导体两端的电压的关系是.二、实验准备(1)实验器材:、和导线若干.(2)实验原理:.合作探究一、实验探究1.电路图如图所示.2.数据记录:U/VI/A3.实验结论:.二、新课学习1.电阻(1)定义:.(2)定义式:.名师精编优秀教案(3)单位:.(4)物理意义:.2.欧姆定律(1)内容:.(2)表达式:.(3)单位:.(4)适用条件:.3.导体的伏安特性曲线:4.线性元件与非线性元件的区别:.三、实例探究若加在某导体两端的电压变为原来的,导体中的电流减小了0.4 A,如果所加电压变为原来的 2 倍,则导体中的电流多大?四、巩固练习一金属导体,两端加上U1=10 V 的电压时电流I1=0.5 A,两端加上U2=30 V 的电压时导体中电流I2多大?若导体两端不加电压,则导体的电阻多大?课堂检测1.根据欧姆定律,下列说法中正确的是()A.从关系式U=IR可知,导体两端的电压U由通过它的电流I和它的电阻R共同决定B.从关系式R=可知,导体的电阻跟导体两端的电压成正比,跟导体中的电流成反比C.从关系式I=可知,导体中的电流跟导体两端的电压成正比,跟导体的电阻成反比D.从关系式R=可知,对一个确定的导体来说,所加的电压跟通过导体的电流的比值是文档编码:CP1W6W7Y3V7 HV1M9T6G7P8 ZW6G3I6I6S3文档编码:CP1W6W7Y3V7 HV1M9T6G7P8 ZW6G3I6I6S3文档编码:CP1W6W7Y3V7 HV1M9T6G7P8 ZW6G3I6I6S3文档编码:CP1W6W7Y3V7 HV1M9T6G7P8 ZW6G3I6I6S3文档编码:CP1W6W7Y3V7 HV1M9T6G7P8 ZW6G3I6I6S3文档编码:CP1W6W7Y3V7 HV1M9T6G7P8 ZW6G3I6I6S3文档编码:CP1W6W7Y3V7 HV1M9T6G7P8 ZW6G3I6I6S3文档编码:CP1W6W7Y3V7 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