串联电路的电流规律

串联电路的电流规律 电学专项练习1,串联电路的电流规律 1((2012•铜仁市)关于串、并联电路，下列说法正确的是( ) A(串联电路电流处处相等 B(串联电路总电阻的倒数等于各电阻倒数之和 C(并联电路各支路电流总相等 D(并联电路的总电阻等于各支路电阻之和 第2题 第4题 第5题 2((2012•深圳)如图所示，灯L比L亮，下列描述错误的是( ) 12 A(L的电阻比L的电阻大 12 B(L两端的电压比L两端的电压大 12 C(通过L的电流比L的电流大 12 D(L的实际功率比L的实际功率大 12 3((2011•南宁)在探究串联电路电流的规律时，电路如图所示(闭合开关，用电流测出A，B，C三处的电流分别为I，I，I(关于它们的大ABC小关系，正确的是( ) A(I,I B(I,I C(I,I D(I=I ABACBCAC 4((2010•曲靖)如图是同种材料制成的金属杆，长度AB=CD，从A、D两端将它接入电路中，通电时下列说法正确的是( ) A(AB两端的电压较大，通过AB、CD的电流相等 filing. 3, the safety records should be complete in time, and continues to project completion. 4, project safety production management information system of the Ministry of health planning, implementation, c d improved checking and correction, a total of four volumes. Construction and environmental protection in other security measures, such as the first civilization construction and environmental management objectives and civilized construction objectives of civil strive to obtain "safe and civilized model site of Zhuhai city" title. Environmental management goal 1, noise, dust, wastewater discharge standards; reducing and controlling the generation of solid waste; 2, reduce the impact of noise on the surrounding environment, noise complaints decreased by 20%; 3, reduce the consumption of raw materials and energy, construction raw material usage below the standards set by the State, average savings rate of 1% the following three materials. Section II project the civilization construct management system to establish a sound and civilized construction system, at all levels and all departments effective implementation of responsibility system for civil construction, ensure the goal of civilization. Ordinal system name 1 education system extensively and civilized construction management education, improve the overall construction initiative, ideology, so that workers form a building B(AB与CD段电阻相等，消耗的电能也相等 C(CD段的电阻较大，通过它的电流较小 D(CD段的电阻较小，AB、CD两端的电压相等 5((2009•德州)入图所示，闭合开关，发现灯泡甲比灯泡乙亮(在该电路中，关于电流、电压、电阻和消耗的电功率大小的判断(正确的是( ) A(I=IB(U,UC(R=RD(P,P 甲乙甲乙甲乙甲乙 第6题 第8题 第9题 6((2008•柳州)如图所示的串联电路，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 7((2008•广安)有两个电阻，R=4Ω，R=6Ω，如果把它们串联在电路12 中，通过它们的电流分别为I、I，它们两端的电压分别为U，U，则，I:12121I、U:U分别为( ) 212 A(1:1，2:3 B(2:3，1:1 C(1:1，1:I D(2:3，2:3 8((2008•恩施州)如图所示，L和L是两只相同的小灯泡，当开关S闭12 合后，电流表的示数( ) A(A示数为零，A示数变大 B(A是A示数的两倍 1221 C(A和A的示数仍相等 D(A示数不变，A示数变大 1212 ve, ideology, so that workers form a buildingame 1 education system extensively and civilized construction management education, improve the overall construction initiatitem nments effective implementation of responsibility system for civil construction, ensure the goal of civilization. Ordinal syscivilization construct management system to establish a sound and civilized construction system, at all levels and all depart ct theterial usage below the standards set by the State, average savings rate of 1% the following three materials. Section II projeng environment, noise complaints decreased by 20%; 3, reduce the consumption of raw materials and energy, construction raw marounditewater discharge standards; reducing and controlling the generation of solid waste; 2, reduce the impact of noise on the surivil strive to obtain "safe and civilized model site of Zhuhai city" title. Environmental management goal 1, noise, dust, wasof c es, such as the first civilization construction and environmental management objectives and civilized construction objectivesimproved checking and correction, a total of four volumes. Construction and environmental protection in other security measur management information system of the Ministry of health planning, implementation, c dfiling. 3, the safety records should be complete in time, and continues to project completion. 4, project safety production 2 9((2007•镇江)如图所示，将两只额定电压相同的灯泡L、L串联在电12路中，闭合开关S后，发现灯泡L较亮，灯泡L较暗，此现象说明( ) 12 A(灯泡L的阻值大于灯泡L的阻值 12 B(灯泡L的额定功率大于灯泡L的额定功率 12 C(灯泡L两端的电压小于灯炮L两端的电压 12 D(通过灯泡L的电流大于通过灯炮L的电流 12 11(有两个额定电压相同的小灯泡，串联起来接到电源上，亮度不同(在分析二个灯泡的额定功率哪个比较大时，要做以下分析: 2?从关系式P=IR可以知道; ?较亮灯泡的电阻较大; ?在相同电压下工作时，灯泡的电功率和它的电阻成反比; ?从关系式P= 2U R 可以知道; ?串联时流过两个灯泡的电流相同; ?所以，串联时那个较暗灯泡的额定功率较大( 请你将最合理的排序选出来( ) A(?????? B(?????? C(?????? D(?????? 12((2012•呼伦贝尔)两只电阻之比R:R=3:5，把它们串联在某电路12 中，则通过的电流之比I:I=( );消耗的电功率之比P:P= ( )( 1212 tiative, ideology, so that workers form a buildingon inial system name 1 education system extensively and civilized construction management education, improve the overall constructidepartments effective implementation of responsibility system for civil construction, ensure the goal of civilization. Ordind all project the civilization construct management system to establish a sound and civilized construction system, at all levels anaw material usage below the standards set by the State, average savings rate of 1% the following three materials. Section II tion re surrounding environment, noise complaints decreased by 20%; 3, reduce the consumption of raw materials and energy, construc, wastewater discharge standards; reducing and controlling the generation of solid waste; 2, reduce the impact of noise on th, dustctives of civil strive to obtain "safe and civilized model site of Zhuhai city" title. Environmental management goal 1, noisemeasures, such as the first civilization construction and environmental management objectives and civilized construction objerity ation, c d improved checking and correction, a total of four volumes. Construction and environmental protection in other secuproject completion. 4, project safety production management information system of the Ministry of health planning, implement filing. 3, the safety records should be complete in time, and continues to3 13((2010•广西)串联电路各处的电流，并联电路等效电阻的倒数等于各支路电阻的( )( 第14题 第18题 第19题 14((2008•天津)如图所示，当开关闭合后电流表A的示数为0.3A，通1 过灯L的电流( )A，电流表A的示数为( )A( 12 15((2006•天津)有一种节日彩灯由20只小灯泡串联而成，如果电源插头处的电流为200mA，那么通过每一只小灯泡的电流为( )mA( 16((2005•莆田)两个阻值不同的电阻，如果将它们串联后接在电路中，则通过它们的电流之比为 ( )，如果将它们并联后接在同一电路中，则加在它们两端的电压之比为 ( ). 17(当初，发明学生用电流表的人应该有以下思维过程: (1)电流表应串联在被测电路中，这样，利用串联电路的特征(“ ”)”可知:电流表显示的电流值就等于被测电路的电流值( (2)为提高测量的精度，电流表的接入对原电路的影响应该可以忽略，因此，电流表的内部电阻应该( )( 18(2008•潍坊)小明同学按如图所示的电路进行实验，实验中电阻R保1持不变，三次调整滑动变阻器R的阻值，得到如下表所示的实验数据: 2 ?分析电流表A、A的示数，可得出(: ); 12 tem nments effective implementation of responsibility system for civil construction, ensure the goal of civilization. Ordinal syscivilization construct management system to establish a sound and civilized construction system, at all levels and all depart ct theterial usage below the standards set by the State, average savings rate of 1% the following three materials. Section II projeng environment, noise complaints decreased by 20%; 3, reduce the consumption of raw materials and energy, construction raw marounditewater discharge standards; reducing and controlling the generation of solid waste; 2, reduce the impact of noise on the surivil strive to obtain "safe and civilized model site of Zhuhai city" title. Environmental management goal 1, noise, dust, wasof c es, such as the first civilization construction and environmental management objectives and civilized construction objectivesimproved checking and correction, a total of four volumes. Construction and environmental protection in other security measur management information system of the Ministry of health planning, implementation, c dfiling. 3, the safety records should be complete in time, and continues to project completion. 4, project safety production ve, ideology, so that workers form a buildingame 1 education system extensively and civilized construction management education, improve the overall construction initiati4 ?分析电压表V、V、V的示数，可得出( )( l2 19((2008•南平)小林用如图所示电路研究串联电路特点，闭合开关后，发现灯L较亮，灯L较暗(他对这一现象的解释是:电流从电源正极出发，12 经过灯L、灯L，电流逐渐变小，所以灯L较亮，灯L较暗(小欢认为1212 小林的解释是错误的，她只利用图中的器材设计了一个实验，并根据实验现象说明小林的解释是错误的(请你完成下列问题: (1)画出小欢所设计的实验电路图( (2)根据实验现象简要说明小林的解释是错误的( 20((2005•甘肃)如图所示，电阻R，和R串联在电路中，现在要计算12 出R的阻值，图中所标出的物理量中至少需要知道哪几个量,如何计算,2 参考表中的示例填写表格(写出两种计算方法)( tiative, ideology, so that workers form a buildingon inial system name 1 education system extensively and civilized construction management education, improve the overall constructidepartments effective implementation of responsibility system for civil construction, ensure the goal of civilization. Ordind all project the civilization construct management system to establish a sound and civilized construction system, at all levels anaw material usage below the standards set by the State, average savings rate of 1% the following three materials. Section II tion re surrounding environment, noise complaints decreased by 20%; 3, reduce the consumption of raw materials and energy, construc, wastewater discharge standards; reducing and controlling the generation of solid waste; 2, reduce the impact of noise on th, dustctives of civil strive to obtain "safe and civilized model site of Zhuhai city" title. Environmental management goal 1, noisemeasures, such as the first civilization construction and environmental management objectives and civilized construction objerity ation, c d improved checking and correction, a total of four volumes. Construction and environmental protection in other secuproject completion. 4, project safety production management information system of the Ministry of health planning, implement filing. 3, the safety records should be complete in time, and continues to5 第21题 21(小明按如图所示的电路图连接电路进行探究性实验，实验时电阻R保1持不变，滑动变阻器R的最大阻值是20Ω，三次改变滑动变阻器的滑片P2 的位置，得到下表中的实验数据: 次数 A示数(A) A示数(A) V示数(V) V示数(V) V示数(V) 1212 1 0.4 0.4 4 8 12 2 0.6 0.6 6 6 12 3 0.8 0.8 8 4 12 请回答:(1)图电路是( )电路，电压表V测( )的电压( (2)比较电流表A和A的示数，可得结论: ( 12 (3)比较三只电压表示数，可得结论: ( (4)比较电流表A(或A)和电压表V示数，可得结论: 121 ( (5)定值电阻R= ( )，第三次实验中R接入电路的电阻为 ( )( 12 (6)当滑动变阻器的滑片P向右移动时，电流表A示数将 ( ) ，1 电压表V示数将 ( )，电压表V示数将 ( )((填变大、12 变小或不变) ve, ideology, so that workers form a buildingame 1 education system extensively and civilized construction management education, improve the overall construction initiatitem nments effective implementation of responsibility system for civil construction, ensure the goal of civilization. Ordinal syscivilization construct management system to establish a sound and civilized construction system, at all levels and all depart ct theterial usage below the standards set by the State, average savings rate of 1% the following three materials. Section II projeng environment, noise complaints decreased by 20%; 3, reduce the consumption of raw materials and energy, construction raw marounditewater discharge standards; reducing and controlling the generation of solid waste; 2, reduce the impact of noise on the surivil strive to obtain "safe and civilized model site of Zhuhai city" title. Environmental management goal 1, noise, dust, wasof c es, such as the first civilization construction and environmental management objectives and civilized construction objectivesimproved checking and correction, a total of four volumes. Construction and environmental protection in other security measur management information system of the Ministry of health planning, implementation, c dfiling. 3, the safety records should be complete in time, and continues to project completion. 4, project safety production 6