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1、名师精编优秀教案第五章第五节探究串、并联电路的电流规律第课时上课时间编写人审核人:【教学目标】:知识与技能:探究串、并联电路中电流的规律;训练连接电路和使用电流表的技能。过程与方法:科学探究全过程的切身体验,领会科学研究的方法。情感、态度与价值观:严谨的科学态度与协作精神。【教学重点、难点】:在实验中探究串、并联电路中电流的规律。组织指导学生在探究过程中,认真观察、分析、得出确结论。【课堂导学】一 探究串联电路电流的规律:(注意:)1 接线时要注意开关必须处于断开的状态;2 不要出现短路现象;电流表要跟被测电路串联;3 电流表的接线要正确:不得出现反接;4 电流表的量程要选准;5 要进行试触;
2、读数时要认清量程和分度值;得出结论:_。表达式:I1=I2=I3二 探究并联电路电流的规律:得出结论:并联电路中干路的电流等于各支路的电流之和。表达式:I=_ 三、基础练习1(08 柳州)如图1所示的串联电路,闭合开关时【】A 通过 A点电流大于B点的电流 B 通过 B点电流大于C点的电流 C 通过 A点电流大于c 点的电流 D 通过 A、B、C三点的电流相等2 甲乙两灯串联在电路中,闭合开关后,发现甲灯比乙灯亮,则正确的是【】A、通过甲灯的电流大B、通过乙灯的电流大C、通过两人灯的电流一样大D、无法确定3 电流通过横截面积大小不等的两段导体A、B,则在两段导体中电路大小分别为IA、IB,则在
3、相同时间内,IA、IB两者之间的大小关系是:【】A.IA=IB;B.IAIB;C.IAIB;D.无法确定.4(20XX 年威海)如图所示,在探究并联电路中的电流关系时,小 明同学用电流表测出A、B、C三处的电流分别为IA 0.5A,IB0.3A,IC0.2A,在表格中记录数据后,下一步首先应该做的是:【】A整理器材,结束实验 B换用不同规格的小灯泡,再测出几组电流值C分析数据,得出结论 D换用电流表的另一量程,再测出一组电流值5、小明要测量L1中电流大小,图中正确的电路图是:【】6 两只灯泡接在电路中,电流表测得通过它们的电流值相等,由此可以判断两灯的连接情况是:【】A.一定是串联;B.一定是
4、并联;C.可能串联,也可能并联;D.无法确定.7 要想同时知道干路电流和各支路的电流,如图所示,各测量方式中不正确的是:【】8(2010 四川泸州)在“探究并联电路电流的特点”实验中,实验电路如图甲所示,闭合开关 S后,电流表A1、A2示数分别如图乙、丙所示,则通过灯泡L1、L2电流大小的判断正确的是【】A、L1的电流大于L2的电流 B、L1的电流等于L2的电流C、L1的电流小于L2的电流 D、无法比较L1、L2的电流大小名师精编优秀教案9(20XX 年浙江湖州)如甲图电路,当开关s 闭合后,电流表的指针偏转如乙图所示,其中 a 电流表测量的是通过(选填“电源L1”或“L2”)的电流,b 电流
5、表的读数应为安。10 如图 13-4-3 所示的电路中,A1的示数是 0.3 A,则 A2的示数是,流过 L2的电流是;如图 13-4-4 所示的电路,电流表A1的示数是1.2 A,电流表A2的示数是0.7 A,则通过L1的电流是,通过 L2的电流是。四、提高练习11 现有两节电池,一个开关,导线若干,两个小灯泡,两个电流表,如图所示。要求:两只小灯泡并联,A1测通过L1的电流,A2测干路的电流。请在方框内画出电路图,并按要求连接实物图。(干路和支路中的电流均小于0.6 A)12(20XX年甘肃兰州)图13 所示为一实物电路,请在答题卡的指定位置画出所对应的电路图。14(20XX年河南)某实验
6、小组按照课本要求探究并联电路中电流的关系,他们设计的电路如图所示。把电流表分别接入到电路中的A、B、C处,测出它们的电流,填入下表:(1)通过对上面数据的分析,可以得出结论是:;(2)测量三次的目的是:,在实验中我们可以采用的方法改变电流的大小从而进行三次实验;(3)结合你用一个电流表做实验时的体会,提出一条对本实验的改进意见:CBA图 13 文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文
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11、Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 Z
12、R10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K6H1S5文档编码:CD7W9C10S1B3 HO2E9Y2Y4W1 ZR10B1K
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14、HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 Z
15、E5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档
16、编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I
17、2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7
18、 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6
19、文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S
20、7I2 HI6F1Q1H5A7 ZE5I9N10K2W6名师精编优秀教案(2)如图器材,要求设计一电路:闭合任 一开关灯都亮.画出电路图并连接实物(3)根据下列要求,画出电路图,并连成实物电路,电键 S1,S2 都闭合时,灯 L1 和 L2 都能发光;断开S1,灯 L1 和 L2 都不发光,若闭合电键S1,断开电键 S2,则只有灯 L1 能发光。(4)如图要求:只闭合开关S1 时,电灯发光,电铃不发声;只闭合开关S2 时,电灯发光,同时电铃发声。并连接实物(5)根据电路图连接实物图S1S2+L1+L1文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:C
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25、HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 Z
26、E5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档
27、编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6名师精编优秀教案文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH
28、3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6
29、F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I
30、9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:
31、CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 H
32、I6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6文档编码:CH3A1M3S7I2 HI6F1Q1H5A7 ZE5I9N10K2W6