沪粤版物理九年级上册物理思维训练（10份打包含答案）

沪粤版物理九年级上册物理思维训练——— 8　动态电路分析———开关类 INCLUDEPICTURE"经历发现过程.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\经历发现过程.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\经历发现过程.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\经历发现过程.tif" \* MERGEFORMATINET 问题　如图所示的甲、乙电路中，闭合开关S后，再闭合开关S1，电压表和电流表的示数如何变化？ INCLUDEPICTURE"SW-51.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-51.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-51.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-51.tif" \* MERGEFORMATINET 【思维路径】 INCLUDEPICTURE"规律应用.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\规律应用.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\规律应用.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\规律应用.tif" \* MERGEFORMATINET (填空题均填“变大”“变小”或“不变”) 1．如图所示，当开关S1由断开到闭合时，电流表示数将_____，电压表示数将_____。 INCLUDEPICTURE"SW-56.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-56.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-56.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-56.tif" \* MERGEFORMATINET (第1题)　INCLUDEPICTURE"SW-55.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-55.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-55.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-55.tif" \* MERGEFORMATINET (第2题) 2．如图所示，当开关S1由断开到闭合时，A的示数将_____，A1的示数将_____，V的示数将_____。 3．如图所示的电路中，电源电压不变，闭合开关S1，电压表和电流表有示数，接着再闭合开关S2时，分析下列常见问题： (1)电压表示数_____； (2)电流表示数_____； (3)电压表和电流表示数的比值_____。 INCLUDEPICTURE"SW-57.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-57.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-57.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-57.tif" \* MERGEFORMATINET (第3题)　INCLUDEPICTURE"SW-58.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-58.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-58.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-58.tif" \* MERGEFORMATINET (第4题) 4．如图所示的电路中，电源电压不变，当各开关状态由开关S2断开、S1和S3闭合转变为开关S2闭合、S1和S3断开时，电流表示数_____，电压表示数_____。 5．【与小灯泡亮暗结合】如图所示，闭合开关S，开关S1由闭合到断开时，下列各种说法中错误的是(　　) A．电路总电阻变大 B．电流表的示数变小 C．灯L变暗 D．电压表的示数变大 INCLUDEPICTURE"SW-59.tif" INCLUDEPICTURE "E:\\24秋\\9物全一册（HK版）安徽专版\\SW-59.tif" \* MERGEFORMATINET INCLUDEPICTURE "E:\\24秋\\9物全一册 ... ...