作者:admin 日期:2023-12-14 00:18:11 浏览:61 分类:生活
1、电阻大小与导体的材料、长度、横截面积和温度有关。当材料和横截面积相同时,导体的长度越长,电阻越大。当材料和长度相同时,导体的横截面积越小,电阻越大。当长度和横截面积相同时,不同材料的导体电阻不同。
2、温度:对大多数导体来说,温度越高,电阻越大,如金属等;对少数导体来说,温度越高,电阻越小,如碳。电阻是导体本身的一种属性,因此导体的电阻与导体是否接入电路、导体中有无电流、电流的大小等因素无关。
3、原因:电阻的阻值与导体的长度成正比,与横截面积成反比。想象一下水管,水管越长,水管中水是不是要通过的时间越长,也就是说阻值越大,水管越粗水管中水要通过的时间越短,也就是说阻值越小。
4、影响电阻大小的因素:材料、长度、横截面积、温度。材料 不同材料的导体,电阻一般不同。长度 相同材料、粗细相同的导体,长度越长,电阻越大;长度越短,电阻越小。
5、当电压一定时,电流越大,电阻越小,反之电流越小,电阻越大。电阻作为导体本身的一种属性,因此导体的电阻与导体是否接入电路、导体中有无电流、电流的大小等因素无关。超导体的电阻率为零,所以超导体电阻为零。
1、电阻-初中物理知识点1 (1)电阻:表示导体对电流阻碍作用的大小。(2)单位:MΩ、kΩ、Ω。(3)影响因素:导体的电阻是导体本身的一种性质,它的大小决定于导体的材料、长度和横截面积,还与温度有关。
2、导体的 和 相同时,导体越长,电阻越 (3)导体的 和 相同时,导体的横截面积越大,电阻越 (4)导体的电阻还和 有关,对大多数导体来说, 越高,电阻越 。
3、电阻(R):表示导体对电流的阻碍作用。(导体如果对电流的阻碍作用越大,那么电阻就越大,而通过导体的电流就越小)。电阻(R)的单位:国际单位:欧姆(Ω);常用的单位有:兆欧(MΩ)、千欧(KΩ)。
4、电阻:表示导体对电流的阻碍作用。(导体如果对电流的阻碍作用越大,则电阻就越大,而通过导体的电流就越小)。国际单位:欧姆(Ω); 常用单位:兆欧(MΩ),千欧(KΩ); 1兆欧=103千欧; 1千欧=103欧。
5、滑动变阻器:①作用:通过电阻的变化,调节电路中的 电流 。②原理:通过滑动臂改变串联在电路中电阻丝的 长度 ,来改变电阻值。
6、注意点:滑动变阻器在接入电路时,应把滑片P移到变阻器电阻值的位置,从而限制电路中电流的大小,以保护电路。 变阻箱:通过改变接入电路定值电阻个数和阻值改变电阻大小的仪器。变阻箱有旋钮式和插入式两种。
1、电阻的量值与导体的材料、形状、体积以及周围环境等因素有关。电阻在电路中用“R”加数字表示,如:R15表示编号为15的电阻。电阻在电路中的主要作用为分流、限流、分压、偏置、滤波(与电容器组合使用)和阻抗匹配等。
2、电线长度和电流的大小成反比的关系。也就是说,当电线长度越长时,电流的大小越小;当电线的长度越短时,电流的大小越大。电线的长度在一定程度上对电流不会太大的影响,通常是可以忽略不计的。
3、相同材料的一定长度的导线的电阻与它的粗细(即横截面积)成反比。(2)相同材料的一定长度的导线的电阻的越粗其电阻值越小。电阻简介:电阻器(Resistor)在日常生活中一般直接称为电阻。
4、导线越粗,电阻越小。马路越宽,允许通过的车流量越大,或者说车子遇堵的时间越少。导线就像马路,越粗电阻越小。粗导线可以理解成是多根细导线的并联。
5、导线的电阻=导线长度除以导线横截面积乘以电阻率。这个公式表明,一条导线,它的电阻大小与长度有关,越长电阻越大;与横截面积有关,横截面积越大,电阻越小。换句话说,导线的电阻与长度成正比,与横截面积成反比。
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