挖掘机电气基础知识.pdf

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1、精品文档目录一、直流电路.................................................................2（一）电路及基本物理量...................................................21.电路...............................................................22.电路中的几个物理量.................................................3（二）欧姆定律及其应用........

2、...........................................41.部分电路欧姆定律...................................................42.全电路欧姆定律.....................................................53.电阻串并联.........................................................6（三）电功和电功率..............................................

3、.........71.电功...............................................................72.电功率.............................................................83.焦耳定律...........................................................8二、磁场.....................................................................9（一）磁

4、的基本知识.......................................................91.磁体与磁极.........................................................92.磁场与磁力线......................................................10（二）电流磁场的产生....................................................101.直流电流产生的磁场........................

5、........................112.环形电流产生的磁场................................................11三、万用表..................................................................12（一）万用表原理........................................................121．测直流电流.......................................................1

6、22．测直流电压.......................................................133．测电阻...........................................................13（二）万用表的使用方法及注意事项........................................141.使用方法..........................................................142.注意事项............................

7、..............................153.测量实例..........................................................15四、传感器的基本概念........................................................20（一）传感器的定义......................................................20（二）传感器的组成..........................