九年级组

图片内容：载人飞船返回地球过程中，穿过大气层时与大气剧烈摩擦，产生大量的热量；着陆前再打开降落伞来减速，最终安全着陆（模拟图）

图片内容：串联电路的电流处处相等

素材应用：串联电路的电流特点。

图片内容：并联电路的干路电流等于各支路电流之和

素材应用：并联电路的电流特点。

图片内容：并联电路的支路电流与支路电阻成反比

素材应用：欧姆定律、并联电路的特点。

图片内容：电源短路时，电路中电流过大，容易烧坏电源

素材应用：短路。

图片内容：楼梯灯控制演示

素材应用：电流与电路。

图片内容：楼梯灯开关是怎样控制电路的

素材应用：电流与电路、电路设计。

楼梯灯开关控制电路的原理：

上楼时，按下楼下开关，开关由2拨向3，此时楼梯灯电路为通路，灯亮；上楼后，按下楼上开关，开关由6拨向5，此时楼梯灯电路断开，灯熄灭。

下楼时，按下楼上开关，开关由5回到6，楼梯灯电路再次接通，灯亮；下楼后，按下楼下开关，开关由3回到2，楼梯灯电路断开，灯熄灭。

图片内容：病房呼叫演示

素材应用：串联与并联电路。

图片内容：病房呼叫原理电路图

素材应用：串联与并联、电路设计。

八年级组

图片内容：天舟三号货运飞船与空间站完成对接

素材应用：运动和静止的相对性。

▲倒车雷达

▲回声定位

▲B超

▲声呐

图片内容：水中倒影

素材应用：光的反射、平面镜成像

图片内容：影子1

素材应用：光的直线传播

图片内容：影子2

素材应用：光的直线传播

图片内容：影子3

素材应用：光的直线传播

图片内容：眼睛看近物时，晶状体变厚，折光能力变强

素材应用：眼睛与眼镜。

图片内容：眼睛看远物时，晶状体变薄（平），折光能力变弱

素材应用：眼睛与眼镜。

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梁瞿爱4437求初中电学电路图的题目 -
纪策冠17512364902 ______ 一、是非题 1.马路上的路灯看上去是排成一串串的,所以它们的连接方法是串联. ( ) 2.几个灯泡接入电路中,只要有一个灯泡不发光,则其他几个灯泡也一定不发光. 3.在并联电路的干...

梁瞿爱4437初四物理电路图练习题 -
纪策冠17512364902 ______ 问题::如何画好电路图 解答 从电源开始,在电源正极标一个A,负极标一个B.然后从正极开始,沿导线走,遇到第一个用电器时在它与正极延伸出的那根电线的那头再标一个A,而在另一头标一个C(应为在负极标过了B,所以换一个字母,...

梁瞿爱4437初中物理谁能给我20个电路图 20个受力图 15个光路图(初中阶段)感激不尽啊!~好就+分啊 -
纪策冠17512364902 ______[答案] 初中物理基本概念概要 一、测量 ⒈长度L:主单位:米;测量工具:刻度尺;公式:P=ρgh h:单位:米; ρ:千克/米3; g=9.8牛/千克.⒊

梁瞿爱4437急要初中物理有关于电路图的题!!!! -
纪策冠17512364902 ______ 一. 填空 1. 电线多用铜线是因为_____________,电炉多用镍铬合金制成是因为_____________,电灯的灯丝用钨丝是因为_____________. 2. 小明是无线电爱好者,他在组装一电子设备时,需要一只阻值为0.025Ω的电阻,现有长2.50m,阻...

梁瞿爱4437问几道初三物理电路题目,有图. -
纪策冠17512364902 ______ (1)由图可以看出电流表和电压表是测R2的则R2电压为2v电流为0.2Au1=u总-u2=6v-2v=4v 因为 I1=I2=I总=0.2A 所以 R1=u1/I1=4V/0.2A=20欧姆(2)你问什么??是不是求最小...

梁瞿爱4437物理电路图习题 -
纪策冠17512364902 ______ 画电路图首先克服怕难思想,然后要掌握方法. 画电路图题型大约可分为以下几种: 1、看实物画出电路图.2、看图连元件作图.3、根据要求设计电路.4、识别错误电路,并画出正确的图.一般考试就以上四种作图,下面就它们的作图方法...

梁瞿爱4437求解 初中物理电路图 -
纪策冠17512364902 ______ 1、 怎样根据电路图画实物图(根据实物图画电路图)初中 (1)逐点分析.譬如说从正极出来一条电线,你就顺着这条电线往下看,到下面肯定要有支路,这个时候现不要管它,顺着你原来看的继续,下面遇到其他支路的时候依旧不要管,直...

梁瞿爱4437物理电路题目
纪策冠17512364902 ______ 如图所示电路中,闭合电键(S2)和断开电键(S1,S3)时,R1与R2串联,闭合电键(S3,S1,)和断开电键(S2)时,R1和R2

梁瞿爱4437初二物理电路题 -
纪策冠17512364902 ______ 判断同一电路中的小灯泡L1和L2的连接情况: (1)流经灯L1的电流全部流经灯L2_串联__ (2)若拿掉灯L1,则L2同时熄灭_串联___ (3)若拿掉L1,灯L2仍发光_并联__ 2、无法确定.有可能是串联,两灯都受开关的控制,相互影响;也有可能两灯是并联,虽相互不影响,但开关在干路上,控制两灯,都能达到“闭合开关时,两灯泡均发光,断开开关时,两灯均熄灭”的效果,所以无法确定.3、电池没电了、灯泡灯丝断了、灯座接触不良.

梁瞿爱4437初中物理电路题
纪策冠17512364902 ______ 当开关S1闭合、S2断开时,两只灯并联. 当两个开关都闭合时,电流从电源的正极流出,经电流表、S2开关、S1开关,再到电源的负极. 电流通过的电路,电阻很小,电路中电流很大,电流表烧坏. 开关S2闭合,两只灯都被短路了,电灯L1、L2没有电流,两只灯都不能发光,也不会烧. 电压表跟导线并联,电压表因电压几乎为0而不会烧坏.