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第10章第2练 闭合电路的欧姆定律_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练

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第10章第2练 闭合电路的欧姆定律_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第10章第2练 闭合电路的欧姆定律_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第10章第2练 闭合电路的欧姆定律_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第10章第2练 闭合电路的欧姆定律_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练

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1.(2022·江苏卷·2)如图所示,电路中灯泡均正常发光,阻值分别为 R =2 Ω,R =3 Ω,R =2 1 2 3 Ω,R=4 Ω,电源电动势E=12 V,内阻不计,四个灯泡中消耗功率最大的是( ) 4 A.R B.R C.R D.R 1 2 3 4 2.交警使用的某型号酒精测试仪如图甲所示,其工作原理如图乙所示,传感器电阻 R的阻 值随气体中酒精浓度的增大而减小,电源的电动势为E,内阻为r,电路中的电表均为理想 电表.当一位酒驾驾驶员对着测试仪吹气时,下列说法中正确的是( ) A.电压表的示数变大,电流表的示数变小 B.电压表的示数变小,电流表的示数变小 C.酒精气体浓度越大,电源的输出功率越大 D.电压表示数变化量与电流表示数变化量的绝对值之比保持不变 3.在如图所示的电路中,开关S闭合后,由于电阻元件发生短路或断路故障,导致电压表和 电流表的读数都增大,电压表和电流表均为理想电表,则可能出现了下列哪种故障 ( ) A.R 短路 B.R 短路 1 2 C.R 短路 D.R 断路 3 1 4.如图所示,图中的四个电表均为理想电表,当滑动变阻器的滑片P向右端移动时,下列说 法中正确的是( )A.电源的输出功率一定变小 B.电压表V 的读数变小,电流表A 的读数变小 1 1 C.电压表V 的读数变大,电流表A 的读数变小 2 2 D.电压表V 的读数变小,电流表A 的读数变小 2 2 5.将一电源与一电阻箱连接成闭合电路,测得电阻箱所消耗功率P与电阻箱读数R变化的曲 线如图所示,由此可知( ) A.电源最大输出功率可能大于45 W B.电源内阻等于5 Ω C.电源电动势为45 V D.电阻箱所消耗功率P最大时,电源效率大于50% 6.(2023·四川内江市第六中学月考)电源的效率定义为外电路电阻消耗的功率与电源的总功率 之比.直线A、B和C分别是电源a、电源b和电阻R的U-I图线.将这个电阻R分别接到 a、b两电源上,那么( ) A.电源a、b电动势一样大,b内阻较大 B.R接到电源a上,电路中的电流较小 C.R接到电源b上,电源的输出功率较大 D.R接到电源b上,电源效率较高 7.(2023·江苏淮安市车桥中学高三测试)如图所示电路,电源内阻为r,两相同灯泡L 、L 1 2 电阻均为R,D为理想二极管(具有单向导电性),电表均为理想电表.闭合S后,一带电油 滴恰好在平行板电容器中央静止不动.现把滑动变阻器滑片向上滑动,电压表 V 、V 示数 1 2 变化量绝对值分别为ΔU 、ΔU ,电流表示数变化量绝对值为ΔI,则下列说法中错误的是( 1 2) A.两灯泡逐渐变亮 B.油滴将向下运动 C.=R+r D.ΔU>ΔU 2 1 8.硅光电池是一种太阳能电池,具有低碳环保的优点.如图所示,图线 a是该电池在某光照 强度下路端电压U和电流I的关系图像(电池内阻不是常量),图线b是某电阻R的U-I图像. 在该光照强度下将它们组成闭合回路时,硅光电池的内阻为( ) A.5.5 Ω B.7.0 Ω C.12.0 Ω D.12.5 Ω 9.(多选)(2023·河南三门峡市外国语高级中学高三检测)如图所示电路中,电源电动势为E, 内阻为r,L为小灯泡,R为滑动变阻器,V为理想电压表.现闭合开关S,将滑动变阻器R 的滑动触头P从a端向b端滑动.已知小灯泡电阻和电源内阻相等,则下列说法中正确的是 ( ) A.电压表示数先变小后变大 B.小灯泡L先变暗后又变亮 C.电源的输出功率先变小后变大 D.电源的效率先减小后增大 10.(2023·河北邯郸市模拟)如图所示,电源电动势E=6 V,内阻r=1 Ω,R =3 Ω,R =7.5 0 1 Ω,R =3 Ω,R =2 Ω,电容器的电容C=2 μF.开始时开关S处于闭合状态,则下列说法正 2 3 确的是( )A.开关S闭合时,电容器上极板带正电 B.开关S闭合时,电容器两极板间电势差是3 V C.将开关S断开,稳定后电容器极板所带的电荷量是3.6×10-6 C D.将开关S断开至电路稳定的过程中通过R 的电荷量是9.6×10-6 C 0 11.在如图甲所示的电路中,R 、R 均为定值电阻,且R =100 Ω,R 阻值未知,R 是一滑 1 2 1 2 3 动变阻器,当其滑片P从最左端滑至最右端时,测得电源的路端电压随电源中流过的电流 的变化图线如图乙所示,其中A、B两点是滑片P在变阻器的两个不同端点得到的.求: (1)电源的电动势和内阻; (2)定值电阻R 的阻值; 2 (3)滑动变阻器的最大阻值. 12.如图所示,电源电动势E=2 V,内阻r=1 Ω,电阻R=2 Ω,滑动变阻器的阻值范围为0 0 ~10 Ω.求滑动变阻器的阻值为多大时,R上消耗的功率最大,最大值为多少?
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  1. CONNECT:[ UseTime:0.000877s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000788s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000245s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000245s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000571s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373468 LIMIT 1 [ RunTime:0.001592s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373468 [ RunTime:0.009932s ]
  10. UPDATE `wendang` SET `lasttime` = 1773118288 WHERE `id` = 373468 [ RunTime:0.000504s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373468 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000708s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373468 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004810s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373468 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003117s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373468 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000877s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373468 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006643s ]
0.162800s