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34.“欧姆定律图像范围计算”-2024年中考物理重难点突破及题型归类总复习_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

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34.“欧姆定律图像范围计算”-2024年中考物理重难点突破及题型归类总复习_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
34.“欧姆定律图像范围计算”-2024年中考物理重难点突破及题型归类总复习_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
34.“欧姆定律图像范围计算”-2024年中考物理重难点突破及题型归类总复习_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

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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 34.“欧姆定律图像范围计算”重难点突破及题型归类 一、欧姆定律经典动态图像计算 图中A点:电路中电流最大,滑动变阻器两端电压为0,滑变R =0 2 图中B点:电路中电流最小,滑动变阻器两端电压最大,滑变R 阻值最大 2 1.求定值电阻阻值 若题目为计算大题:利用电源电压不变列方程:U =U+U,求出R 总 1 2 1 A点:U =IR+U……………………① 总 1 1 2 B点:U =I′R+U′………………② 总 1 1 2 (由图像可知:I、I′、U、U′,两个方程两个未知量,可求R 和U ) 1 1 2 2 1 总 若题目为选择或填空:直接用结论——定值电阻 推导过程: 联立①②式得:IR+U=I′R+U′ 1 1 2 1 1 2 (I- I′)R = U′-U 1 1 1 2 2 ΔI·R=ΔU 1 ∴ (ΔU电压变化量,ΔI电流变化量) 2.求电源电压 将R 代入上面任意一个方程中即中求解。 1 3.求滑动变阻器最大阻值 在图像中找“电流最小”的点,利用该点求解。 例1.如图甲所示的电路中,R 为定值电阻,R 为滑动变阻器,电流表示数I与电压表示数U的变化 1 2 关系如图乙所示,闭合开关S后,求: (1)R 的阻值为多少? 1 (2)电源电压为多少? (3)滑动变阻器的最大阻值为多少? 1 第 页 共 3 页 学科网(北京)股份有限公司关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 解析:由图知,R 与R串联,测R 两端电压 1 2 2 (1)图中A点:电路中电流最大I=1.2A,R 两端电压U=0,R=0 1 2 2 2 U =U+U 总 1 2 U =IR+U=1.2A×R+0……………………① 总 1 1 2 1 图中B点:电路中电流最小I′=0.4A,R 两端电压U′=4V,R 阻值最大 1 2 2 2 U =I′R+U′=0.4A×R+4V ……………② 总 1 1 2 1 联立①②式得:1.2A×R=0.4A×R+4V 1 1 R=5Ω 1 (2)把R=5Ω代入①式得:U =IR=1.2A×5Ω=6V 1 总 1 1 (3)图中B点:电路中电流最小时,滑动变阻器阻值最大 提醒:如果这是一道选择或填空题,可直接利用: 。 第(1)问: 二、欧姆定律动态电路范围与极值计算 1.移动滑动变阻器滑片,求两表示数范围 解题思路:化动态为静态,取滑动变阻器阻值最大和最小两种情况,求出对应电流I、电压U。 例2.在如图所示的电路中,电源电压为6V且不变,电阻R 阻值为20Ω,滑动变阻器R 的最大阻值 1 2 为30Ω,闭合开关,将滑动变阻器的滑片P由最左端移动到最右端时,电压表、电流表的示数范围分别是 多少? 解析:(1)当滑片位于最左端时,R=0,即电路中只有R 工作,此时电路中电流最大,R 两端电压 2 1 1 即示数最大:U =U =6V R1 总 (2)当滑片P位于最右端时,R′=30Ω,R 和R′串联,此时电路中电流最小,R 两端电压即示 2 1 2 1 2 第 页 共 3 页 学科网(北京)股份有限公司关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 数最小 U =I R=0.12A×20Ω=2.4V R1 min 1 综上,示数范围:6V~2.4V;示数范围:0.3A~0.12A。 2.已知两表量程,为保护电表,求滑动变阻器阻值范围 (1)R↑→↑→↓,此时的量程会限制滑动变阻器的最大阻值,即当示数最大时,求出R 2 2max (2)R↓→↓→↑,此时的量程会限制滑动变阻器的最小阻值,即当示数最大时,求出R 2 2min 注意:当出现多约束条件时,电路中的最大电流取最小的(照顾弱小)!如:电阻铭牌“50Ω 0.3A”、滑动变阻器“30Ω 1A”、:0~0.6A,此时,该电路中的最大电流为0.3A。 例3.已知R=8Ω,滑动变阻器最大阻值R =50Ω,U =6V,:0~0.6A,:0~3V,为了保护电表, 1 2max 总 R 的取值范围是_____________。 2 解析:由图知,R 和R 串联,测R 两端电压 1 2 2 (1)当示数最大时,R 阻值最大,U =3V,U =6V,U =U -U =6V-3V=3V 2 R2 总 R1 总 R2 , (2)当示数最大时,R 阻值最小,此时电路中电流I′=0.6A 2 ,R =R -R=10Ω-8Ω=2Ω 2min 总 1 综上,滑动变阻器的取值范围是2Ω~8Ω 3 第 页 共 3 页 学科网(北京)股份有限公司
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  1. CONNECT:[ UseTime:0.001035s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001582s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000696s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000708s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001796s ]
  6. SELECT * FROM `set` [ RunTime:0.000670s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001945s ]
  8. SELECT * FROM `wendang` WHERE `id` = 330539 LIMIT 1 [ RunTime:0.006366s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 330539 [ RunTime:0.001630s ]
  10. UPDATE `wendang` SET `lasttime` = 1772469656 WHERE `id` = 330539 [ RunTime:0.001341s ]
  11. SELECT * FROM `wendang` WHERE `id` < 330539 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001251s ]
  12. SELECT * FROM `wendang` WHERE `id` > 330539 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001022s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 330539 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007796s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 330539 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003033s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 330539 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005352s ]
0.130722s