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串联分压、并联分流与灯泡亮暗的判定_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列_❤更新专项复习

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串联分压、并联分流与灯泡亮暗的判定_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列_❤更新专项复习
串联分压、并联分流与灯泡亮暗的判定_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列_❤更新专项复习
串联分压、并联分流与灯泡亮暗的判定_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列_❤更新专项复习
串联分压、并联分流与灯泡亮暗的判定_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列_❤更新专项复习

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关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 串联分压、并联分流与灯泡亮暗的判定 一、串联分压原理 技巧:阻大压大成正比 在一段串联电路中,各电阻两端电压之比,等于其电阻阻值之比。 U:U:U=R:R:R 1 2 3 1 2 3 在选择题中应用可以快速理清关系和解决问题。 推导过程: 串联电路电流处处相等,因此, U:U:U=IR :IR :IR =R:R:R 1 2 3 1 2 3 1 2 3 例1.在如图所示电路中,两个电阻分别为5Ω和10Ω,电源电压为6V,求R 和R 两端的电压? 1 2 解析:串联分压,U:U=R:R=1:2 1 2 1 2 电源电压U=6V,可直观得到U=2V,U=4V 1 2 二、并联分流原理 技巧:阻大流小成反比 在一段并联电路中,各支路电流之比,等于其电阻阻值的倒数之比。 I:I:I=1/R:1/R:1/R 1 2 3 1 2 3 注意:最后各比项乘以公分母化为最简整数比! 推导过程: 并联电路中支路电压相等, I:I:I=U/R:U/R:U/R=1/R:1/R:1/R 1 2 3 1 2 3 1 2 3 例2.如图所示,电源电压恒定,电阻R=10Ω,R=20Ω,通过干路电流I=0.6A,求通过R 和R 的电 1 2 1 2 流? 解法一:并联电路,总电阻:R=RR/(R+R)=20/3 1 2 1 2 电源电压:U=IR=4V 则I=U/R=0.4A,I=U/R=0.2A 1 1 2 2 解法二:并联电路,I:I=1/10:1/20 1 2 得到:I=0.4A,I=0.2A 1 2 三、灯泡亮暗的判定——看实际功率 类型一:灯泡正常发光时亮暗的比较 资1 料整理【淘宝店铺:向阳百分百】关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 技巧:灯泡亮暗看P ,P 越大,灯越亮。 实 实 关键词:“正常工作”,P 与P 相等。 实 额 例3.甲标有“220V 40W”字样,乙标有“220V 25W”字样。关于亮度,正确的是( ) A.甲一定比乙亮 B.都正常工作时,甲比乙亮 分析:A选项,甲、乙都是P ,不能直接判断;B选项有关键词:P =P 。 额 实 额 解答:首先,亮度看实际功率,P 越大,灯越亮。不要依据额定功率去判断。 实 其次,关键词“正常工作”时:P =P 。 实 额 例4.甲、乙额定电压相同,但甲的电阻大于乙的电阻。问:正常工作时,甲、乙谁亮?( ) 分析:灯泡亮度还是看P ,通过公式 判断。 实 关键词:“正常工作”,U =U ,R大,P小,灯暗。 实 额 类型二:串联电路中灯泡亮暗问题 技巧:谁电阻大,谁的P 就大,谁就亮 实 原理:I相同,U=U+U,P =I2R。 1 2 实 常出现的关键词:①“相同的灯”:电阻相同,P 相同;②“又串一只 R”:串联电阻: 实 2 R=R+R,R大,I小,R 不变,P 变小(暗)。 1 2 1 1 ,R大,U不变,P 变小(暗)。 总 例5.L、L 串联,L 灯亮,请问:( ) 1 2 2 A.I>I B.R>R C.U R; 2 2 1 C选项,I相同,R 大,分压多,U >U ; 2 实2 实1 D选项,没说正常发光。 答案:C。 例6.“12V 12W”的L,“12V 6W”的L。串联在电源电压为12V的电路中,谁更亮? 1 2 解析:串联电路,谁R大,谁P 大,谁亮。 实 由 ,P 大,R大。 额 12W>6W,所以R>R,P>P,所以L 灯亮。 1 2 1 2 1 例7.完全相同的L 和L,串联起来,谁更亮? 1 2 解析:完全相同→R相同→串联I相同→P =I2R 实 所以,P 相同→亮度相同。 实 资2 料整理【淘宝店铺:向阳百分百】关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 类型三:并联电路中灯泡亮暗问题 技巧:谁电阻小,谁的P 就大,谁就亮 实 原理:U相同,I=I+I, 。 1 2 常出现的关键词:“又并一只R”,越并电阻越小,R小,U不变,P 变大。 2 总 例8.标有“6V 3W”的L 和“6V 2W”的L 并联在6V电源上,谁更亮? 1 2 解析:并联→U相同→6V→都正常:P>R→L 亮。 1 2 1 例9.标有“12V 12W”的L 和“6V 6W”的L 并联在6V电源上,谁更亮? 1 2 解析:并联→U相同→6V(实际电压)。 , , 可见P
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  1. CONNECT:[ UseTime:0.000502s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000664s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000328s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000463s ]
  6. SELECT * FROM `set` [ RunTime:0.000230s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000647s ]
  8. SELECT * FROM `wendang` WHERE `id` = 368572 LIMIT 1 [ RunTime:0.000384s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 368572 [ RunTime:0.010631s ]
  10. UPDATE `wendang` SET `lasttime` = 1773081626 WHERE `id` = 368572 [ RunTime:0.000522s ]
  11. SELECT * FROM `wendang` WHERE `id` < 368572 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003081s ]
  12. SELECT * FROM `wendang` WHERE `id` > 368572 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000501s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 368572 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001230s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 368572 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003339s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 368572 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005266s ]
0.098244s