当前位置:首页>文档>押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615

押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615

  • 2026-03-10 07:20:54 2026-03-10 07:20:54

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押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615
押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615
押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615
押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615
押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615
押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615
押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615
押全国卷17题:交变电流与电路(原卷版)_4.2025物理总复习_2024年新高考资料_5.2024三轮冲刺_备战2024年高考物理临考题号押题(新高考通用)324057615

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押全国卷17题:交变电流与电路(联系生活实际) 核心考点 考情统计 考向预测 备考策略 交变电流的产生和描述、 2020·新课标Ⅱ 理想变压器、远距离输电 注重回归教材以及对基本 交变电流的产 卷 生和描述 等都是高考考查的重点, 概念、基本规律的理解。能快 理想变压器 尤其需要关注与理想变压 速把新的情境与学过的知识和 2020·新课标Ⅲ 远距离输电 器以及等效电阻计算相关 模型建立联系。 卷 的题目。 1.(2020·新课标Ⅱ卷,T19)特高压输电可使输送中的电能损耗和电压损失大幅降低。我国已成功掌握并实 际应用了特高压输电技术。假设从A处采用550 kV的超高压向B处输电,输电线上损耗的电功率为∆P,到达B 处时电压下降了∆U。在保持A处输送的电功率和输电线电阻都不变的条件下,改用1 100 kV特高压输电,输电 线上损耗的电功率变为∆P′,到达B处时电压下降了∆U′。不考虑其他因素的影响,则( ) 1 1 A.∆P′= ∆P B.∆P′=1 ∆P C.∆U′= ∆U D.∆U′=1 ∆U 4 2 4 2 2.(2020·新课标Ⅲ卷,T20)在图(a)所示的交流电路中,电源电压的有效值为220V,理想变压器原、副线 圈的匝数比为10∶1,R、R、R 均为固定电阻,R=10,R=20,各电表均为理想电表。已知电阻R 中电 1 2 3 2 3 2 流i 随时间t变化的正弦曲线如图(b)所示。下列说法正确的是( ) 2 A.所用交流电的频率为50Hz B.电压表的示数为100V C.电流表的示数为1.0A D.变压器传输的电功率为15.0W 1、交变电流的四个值物理含义 重要关系 适用情况 e=E sin ωt m 瞬时值 交变电流某一时刻的值 计算线圈某时刻的受力 i=I sin ωt m E =nBSω 确定用电器的耐压值,如电容 m 最大值 最大的瞬时值 I = 器、晶体管等的击穿电压 m ①计算与电流热效应相关的 对正(余)弦式交流 量,如功、功率、热量等;② 跟交变电流的热效应等 电: 有效值 交流电表的测量值;③电气设 效的恒定电流值 E=,U= 备所标注的额定电压、额定电 I= 流;④保险丝的熔断电流 交变电流图象中图线与 =n 计算通过电路某一截面的电荷 平均值 时间轴围成面积与时间 = 量:q=·t 的比值 有效值的理解:交变电流、恒定电流I 分别通过同一电阻R,在交流电的一个周期内产生的焦耳 直 热分别为Q 、Q ,若Q =Q ,则交变电流的有效值I=I (直流有效值也可以这样算)。正余 交 直 交 直 直 弦电流与非正余弦电流有效值的计算:①有效值是根据电流的热效应,要抓住“三同”:“相 同时间”内“相同电阻”上产生“相同热量”列式求解。②利用两类公式Q=I2Rt和Q=t可分 别求得电流有效值和电压有效值。③若图象部分是正弦(或余弦)交流电,其中的从零(或最大 值)开始的周期整数倍的部分可直接应用正弦式交变电流有效值与最大值间的关系I =I、U =U m m 求解。交流的最大值是有效值的倍仅适用于正(余)弦式交变电流。 2、变压器 类型 变压器 图例 构造 由原线圈、副线圈和闭合铁芯组成。 工作原理 电磁感应的互感现象 功率关系 P =P 入 出频率关系 f =f 入 出 电压关系 =,若n>n,为降压变压器,若n
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  1. CONNECT:[ UseTime:0.000896s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001514s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000731s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000711s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001296s ]
  6. SELECT * FROM `set` [ RunTime:0.000572s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001495s ]
  8. SELECT * FROM `wendang` WHERE `id` = 371355 LIMIT 1 [ RunTime:0.013033s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 371355 [ RunTime:0.001952s ]
  10. UPDATE `wendang` SET `lasttime` = 1773098724 WHERE `id` = 371355 [ RunTime:0.003481s ]
  11. SELECT * FROM `wendang` WHERE `id` < 371355 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006040s ]
  12. SELECT * FROM `wendang` WHERE `id` > 371355 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015265s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 371355 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018263s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 371355 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012315s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 371355 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010066s ]
0.257853s