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1、徐州市第三十五中学九年级物理学案13.3 电流和电流表的使用(第三课时）班级姓名学习目标：1会正确将电流表接入串联和并联电路；2知道串联电路和并联电路中电流的规律。3会正确使用电流表。重难点：1.电路的连接2.电流表的使用知识回顾1电流的大小用来表示，字母符号是，在国际单位制中它的单位。2测量电路中电流大小的仪器叫。实验室常用的一种有三个接线柱，如果把标有“-”的接线柱和标有“3”的接线柱接到电路中，表示选取用的量程。读数时，应以刻度盘（上排/下排）的刻度为准，如图13（1）所示。电流表的分度值为 A。图中的读数是 A。3.串联电路的电流特点:_ _ 并联电路的电流特点:基础知识训练1将电流表
2、直接接到直流电源的两极上产生的后果是（）A电源和电流表都可能被烧坏 B电源易被烧坏，电流表不易烧坏C电流表易被烧坏，电源不易被烧坏 D电源和电流表都一定不会被烧坏2 家用手电筒灯泡中的电流约为0.3A，在用有 00.6A 和 0 3A两个量程的电流表时，为使精确和安全，应选用（）A0 3A B 00.6A C先用 03A，后改用0 0.6A D无法选择3在如图 13（12）所示的电路中，若A1的读数是0.2A,A2 的读数是0.3A,则 A的读数是（）A.0.1A B.0.2A C.0.3A D.0.5A 电流表的使用1.下面能够用电流表测出流过L1的电流大小的电路是（）+-+-+-.在如图所
3、示的电路中，某同学在实验时，误把电流表并联在灯泡L2的两端，这时观察到的现象是（）A.两灯均不亮 B.两灯亮度不变C.L1比原来亮，L2不亮 D.无法判断3.如图,当开关 S闭合时,将发生的现象是（）A.灯可能被烧坏B.电流表可能被烧坏C.灯和电流表都可能被烧坏D.不会发生任何事故4.如图,电流表 A1 的示数为0.3A,A2的示数为0.5A,则灯 L2的电流为 A.若两电流表的示数突然变成相等且还有一灯亮,电路故障可能是什么?5根据实物图画出电路图6如右图，电流表所测的是通过_的电流画出它的电路图L1 L2 A2A1文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K
4、1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1
5、K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5
6、V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K
7、7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7
8、I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2
9、J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O
10、7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8连接实物图1.按图甲所示的电路图将图乙中的实物元件连成电路2.在下图甲中，闭合开关后，通过灯泡L1的电流为0.5 A,通过灯泡L2的电流为0.4 A.试根据图甲将图乙中的实物用笔画线表示导线连接起来。3.如下左图所示,有一根导线尚未连接好,请用笔画线代替导线补上,补上后要求:当开关闭合时,两灯都发光,且电流表的示数不变.4.用笔画线表示导
11、线,将上面右图中的电路连线完成,要求:灯泡 L1和 L2并联,用电流表测L1中的电流.电路故障1.如图，若开关S 闭合后，灯L1、L2均不亮，小华利用一根导线去检查电路故障，当她将导线连接在灯L1两端时，两灯均不亮，将导线连接在灯L2两端时，灯 L1亮而灯 L2不亮，由此可以判断（）A、灯 L1短路 B、灯 L2短路C、灯 L1断路 D、灯 L2断路甲乙文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F
12、8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1
13、L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7
14、B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K
15、1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1
16、K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5
17、V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K
18、7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F82.如图 7 所示，闭合开关S时，灯泡L1、L2都不亮。用一段导线的两端接触a、b 两点时，两灯都不亮；接触b、c 两点时，两灯都不亮；接触C、d 两点时，两灯都亮。则 A.灯 L1断路 B.灯 L2断路C.灯 L2短路 D.开关 S断路实验题1.在探究串联电路的电流特点时，小名同学连接了如图所示的电路。在连接电路时，开关应_，经检查无误后，闭合开关，三灯L1,L2,L3均发光，接着他应_，实验时他记录了如下表中的实验数据，由表1 的数据分析可知：_；2.小丽用 0-0.6A 和 0-3A 两个量程的电
19、流表,研究图甲所示电路中通过a、b 两点的电流大小关系（电流大小相等）。电流表接在 a 点时，指针的位置如图乙，电流表接在b 点时，指针的位置如图丙。（1）两次测量指针的位置不同的原因是；3.如图是“探究串联电路电流特点”的实验电路图：（1）实验中，选择两个小灯泡的规格应该是 _ 的（填“相同”或“不相同”）。（2）实验中某同学发现两个串联的小灯泡中，一个发光，一个不发光，造成其中一个小灯泡不发光的原因是（）A通过灯泡的电流小B灯泡的灯丝断了C小灯泡靠近负极文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S
20、5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8
21、文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L
22、3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B
23、7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1
24、F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K
25、1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8文档编码:CH7I1K1L3M10 HN2J5V7B7S5 ZB3O7K7K1F8