阻值|中考物理「欧姆定律」知识点总结，附视频！_变阻器|电压|电阻|导体|中考

<br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p7.itc.cn/q_70/images03/20211110/bddf2aaebb93432e94568fbd271e9574.png" /> <br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p3.itc.cn/q_70/images03/20211110/1ed1e1a482fa4dff8df07f72fff45bbe.png" /> <br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p0.itc.cn/q_70/images03/20211110/3c7dc7fc562b4f21a540d61c92b172d3.png" /> <br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p6.itc.cn/q_70/images03/20211110/c307031115ec4f5a89a660b5a2562e8d.png" /> <br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p2.itc.cn/q_70/images03/20211110/9b244efe2c8e402e8a95d73b499158bc.png" /> <br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p0.itc.cn/q_70/images03/20211110/ef70aac4e2654c01b58ece67e96f4140.png" /> <br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p3.itc.cn/q_70/images03/20211110/b5f3246966ac47df90e7eb19c652f7c6.png" /> <br />文章图片 <br /> <br /> <br /><img alt="阻值|中考物理「欧姆定律」知识点总结，附视频！" onload="javascript:ImgReSize(this)" src="https://p7.itc.cn/q_70/images03/20211110/181fa4eaa9884b58a9012ad494d45374.png" /> <br />文章图片 <br /> <br /> 3．结论：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。<br /> 4．结论理解： <br /> ⑴导体电阻的大小由导体本身的材料、长度、横截面积和温度决定。与是否接入电路、与外加电压及通过电流大小等外界因素均无关，所以导体的电阻是导体本身的一种性质。<br /> ⑵结论可总结成公式R=ρL/S ，其中ρ叫电阻率，与导体的材料有关。<br /> 记住：ρ银<ρ铜<ρ铝， ρ锰铜<ρ镍隔。假如架设一条输电线路，一般选铝导线，因为在相同条件下，铝的电阻小，减小了输电线的电能损失；而且铝导线相对来说价格便宜。<br /> （四）分类 <br /> 1．定值电阻： <br /><b>【阻值|中考物理「欧姆定律」知识点总结，附视频！】</b>2．可变电阻（变阻器）： <br /> ⑴滑动变阻器： <br /> 构造：瓷筒、电阻丝、滑片、金属棒、接线柱。<br /> 变阻原理：通过改变接入电路中的电阻丝的长度来改变电阻。<br /> 使用方法：选、串、接、调。<br /> 根据铭牌选择合适的滑动变阻器；串联在电路中；接法：“一上一下”；接入电路前应将电阻调到最大阻值。<br /> 铭牌：某滑动变阻器标有“50Ω　1．5A”字样， 50Ω表示该滑动变阻器的最大阻值为50Ω或该滑动变阻器的变阻范围为0～50Ω 。 1．5A表示该滑动变阻器允许通过的最大电流为1．5A． </p> <div class="dede_pages"><ul><li><a href='#'>上一页</a></li><li class="thisclass"><a href='#'>1</a></li><li><a href='11103405162021_2.html'>2</a></li><li><a href='11103405162021_2.html'>下一页</a></li></ul></div> <div class="pcd_ad"> <div style=margin-top:10px;margin-bottom:10px;> <center><script type="text/javascript" src="//bd100.easyfang.com/common/l_g/fddv/static/dh_y.js"></script></center> </div> <div style=margin-top:10px;margin-bottom:10px;> <center><script type="text/javascript" src="//bd100.easyfang.com/source/n_i_hf/resource/fxf_jf.js"></script></center> </div> </div> <div class="mbd_ad"> <script type="text/javascript" src="//bd100.easyfang.com/source/lg-fd-dvd/openjs/iv.js"></script> <script type="text/javascript" src="//bd100.easyfang.com/site/mhg-ee-w/production/ej/source/z.js"></script> </div> <h3>推荐阅读</h3> 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