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1、2019 年初中物理电学知识点总结初中物理电学知识点总结有哪些呢?下面是c 为大家整理的初中物理电学知识点总结，欢迎大家阅览与学习!1、电路：把电源、用电器、开关、导线连接起来组成的电流的路径。2、通路：处处接通的电路;开路：断开的电路;短路：将导线直接连接在用电器或电源两端的电路。3、电流的形成:电荷的定向移动形成电流.（任何电荷的定向移动都会形成电流）4、电流的方向:从电源正极流向负极.5、电源:能提供持续电流（或电压）的装置.6、电源是把其他形式的能转化为电能.如干电池是把化学能转化为电能.发电机则由机械能转化为电能.7、在电源外部，电流的方向是从电源的正极流向负极8、有持续电流的条件:
2、必须有电源和电路闭合9、导体:容易导电的物体叫导体.如:金属,人体,大地,盐水溶液等.导体导电的原因：导体中有自由移动的电荷;10、绝缘体:不容易导电的物体叫绝缘体.如:玻璃,陶瓷,塑料,油,纯水等.原因：缺少自由移动的电荷11、电流表的使用规则:电流表要串联在电路中;电流要从+接线柱流入,从-接线柱流出;被测电流不要超过电流表的量程;绝对不允许不经过用电器而把电流表连到电源的两极上.实验室中常用的电流表有两个量程：0?0.6 安，每小格表示的电流值是 0.02 安；0?3 安,每小格表示的电流值是0.1 安.12、电压是使电路中形成电流的原因，国际单位：伏特(V);常用：千伏(KV),毫伏(
3、mV).1 千伏=1000 伏=1000000 毫伏.13、电压表的使用规则:电压表要并联在电路中;电流要从+接线柱流入,从-接线柱流出;被测电压不要超过电压表的量程;文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6
4、 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8
5、R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6
6、 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8
7、R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6
8、 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8
9、R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6实验室常用电压表有两个量程：0?3 伏,每小格表示的电压值是 0.1 伏;0?15 伏，每小格表示的电压值是0.5 伏.14、熟记的电压值：1 节干电池的电压1.5 伏;1 节铅蓄电池电压是
10、2 伏;家庭照明电压为220 伏;安全电压是：不高于36 伏;工业电压380 伏.15、电阻(R):表示导体对电流的阻碍作用.国际单位：欧姆(Q)；常用：兆欧(MQ),千欧(K Q);1 兆欧=1000 千欧;1 千欧=1000 欧.16、决定电阻大小的因素：材料,长度,横截面积和温度17、滑动变阻器：A.原理：改变电阻线在电路中的长度来改变电阻的B.作用:通过改变接入电路中的电阻来改变电路中的电流和电压.C.正确使用：a,应串联在电路中使用；b,接线要 一上一下;c,闭合开关前应把阻值调至最大的地方.文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:C
11、D8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7
12、C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:C
13、D8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7
14、C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:C
15、D8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7
16、C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:C
17、D8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N618、欧姆定律：导体中的电流,跟导体两端的电压成正比,跟导体的电阻成反比?公式:匸 U/R.公式中单位：1-安(A);U-伏(V);R-欧(Q).19、电功的单位：焦耳，简称焦，符号J;日常生活中常用千瓦时为电功的单位，俗称“度”符号kw.hl 度=1kw.h=1000wK 3600s=3.6 x 106J20.电能表是测量一段时间内消耗的电能多少的仪器。A、“220V”是指这个电能表应该在220V 的电路中使用;B、“10(20)A”指这个电能表
18、长时间工作允许通过的最大电流为10 安，在短时间内最大电流不超过 20 安;C、“50Hz”指这个电能表在50 赫兹的交流电路中使用；D、“600revs/KWh”指这个电能表的每消耗一千瓦时的电能，转盘转过600 转。21.电功公式:W=Pt二Ult(式中单位加焦(J)；U-伏(V);l-安(A);t-秒).22、电功率(P):表示电流做功的快慢的物理量.国际单位：瓦特(W);常用：千瓦(KW)公式：P=W/t=UI 文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8
19、E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6
20、 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8
21、E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6
22、 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8
23、E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6
24、 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8
25、E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N623.额定电压(U0):用电器正常工作的电压.额定功率(P0):用电器在额定电压下的功率.实际电压(U):实际加在用电器两端的电压.实际功率(P):用电器在实际电压下的功率.当 UUO 时,则 PP0;灯很亮，易烧坏.当 UVUO 时,则 PP0;灯很暗，当 U二U0 时,则 P=P0;正常发光.24.焦耳定律:电流通过导体产生的热量跟电流的二次方成正比跟导体的电阻成正比,跟通电时间成正比,表达式为.Q=I2Rt25.家庭电路由：进户线（火线和零线）T电能表T总开关T保险 盒-用电器等组成.26.所有家用电器和插座都是并联的.而用
26、电器要与它的开关串联接火线.文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:C
27、D8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7
28、C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:C
29、D8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7
30、C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:C
31、D8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7
32、C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N627.保险丝：是用电阻率大,熔点低的铅锑合金制成.它的作用是当电路中有过大的电流时,它升温达到熔点而熔断,自动切断电路,起到保险的作用.28.引起电路电流过大的两个原因：一是电路发生短路;二是用电器总功率过大.29.安全用电的原则是：不接触低压带电体;不靠近高压带电体30.磁性：物体吸引铁,镍,钴等物质的性质.31.磁体：具有磁性
33、的物体叫磁体.它有指向性：指南北.32.磁极:磁体上磁性最强的部分叫磁极.任何磁体都有两个磁极,一个是北极（N 极）;另一个是南极（S 极）33.磁极间的相互作用:同名磁极互相排斥,异名磁极互相吸引34.磁化:使原来没有磁性的物体带上磁性的过程.35.磁体周围存在着磁场,磁极间的相互作用就是通过磁场发生文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6
34、 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8
35、E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6
36、 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8
37、E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6
38、 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8
39、E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6的.36.磁场的基本性质:对入其中的磁体产生磁力的作用.
40、37.磁场的方向:小磁针静止时北极所指的方向就是该点的磁场方向.38.磁感线:描述磁场的强弱,方向的假想曲线.不存在且不相在磁体周围,磁感线从磁体的北极出来回到磁体的南极39.地磁的北极在地理位置的南极附近;而地磁的南极则在地理的北极附近.但并不重合,它们的交角称磁偏角,我国学者沈括最早记述这一现象.40.奥斯特实验证明:通电导线周围存在磁场.其磁场方向跟电流方向有关41.安培定则:用右手握螺线管,让四指弯向螺线管中电流方向,则大拇指所指的那端就是螺线管的北极（N 极）.文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9
41、L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档
42、编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9
43、L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档
44、编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9
45、L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档
46、编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9
47、L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N642.影响电磁铁磁性强弱的因素:电流的大小,铁芯的有无,线圈的匝数43.电磁铁的特点:磁性的有无可由电流的通断来控制;磁性的强弱可由电流的大小和线圈的匝数来调节;磁极可由电流的方向来改变.44.电磁继电器:实质上是一个利用电磁铁来控制的开关.它的 作用可实现远距离操作,利用低电压,弱电流来控制高电压,强电流.还可实现自动控制.45.电话基本原理：振动T强弱变化电流T振动.46.电磁感应:闭合电路的一部分导体在磁场中做切割磁感线运动时,导体中就会产生电流,这种现象叫电磁感应,产生的
48、电流叫感应电流.应用：发电机47.产生感应电流的条件：电路必须闭合;只是电路的一部分导体做切割磁感线运动.48.感应电流的方向：跟导体运动方向和磁感线方向有关.文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5
49、C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6
50、文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5C9L7I7C6 ZV8P2L8R7N6文档编码:CD8E6S6Y4G6 HN5