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usb插头黑色线为地线（Ground）,红色为电源正极（+5Volt或VCC）,白色为数据负线（USB Port-或Data-），绿色线为数据正线（USB Port+或Data+） 相信很多锂电池初学者，分不清电池的正极、负极、阴极、阳极；或者不理解阴极为什么又是正极？ 阳极为什么又是负极？ 仔细阅读本文，相信你不会再有疑问。 说明：本文以 钴酸锂 （LiCoO2）为正极材料， 石墨 （C）为负极材料进行阐述分析。 下面请看正文。 打开 万用表,切到20V直流电, 把万用表的红线 (正极)连数据USB线的红线, 万用表的黑线连USB线的黑线. 如果显示5V,说明红线是正极,黑线是负极.
红色线是正极（+5V），黑色线是负极（GND），绿色和白色是数据线。 掌握这些基础知识，不仅能帮助您更好地理解身边的电子产品，还能在需要时进行安全、有效的DIY或维修。 1/3 分步阅读 首先，从型号上了解DC头的规格，DC2.1指的就是内径2.1mm, DC2.5指的就是内径2.5mm 2/3 从外形上了解DC头的正负极，目前DC头一般都是圆孔为正极，外圈为负极 将充电器的两根电线连接到电池的两端。 如果充电器指示灯暗 (或关)，说明连接电池正极的导线是负极，而连接电池负极的导线是正极。
通常情况下，红色线代表正极，黑色线代表负极。 但需要注意的是，这并非绝对标准，有些非标准的充电器线可能不遵循此规则。
1、 USB 母头插口对着自己，塑料块靠上（此方向为正常USB底部贴片方向） 最左边的pin为正极，最右边的pin为负极，如图所示 2、USB公头 插口 对外，塑料块靠下 最左边的pin为正极，最右边的pin为负极 在手机接口上，正极通常位于插头的金属片上，而负极则位于插头的塑料部分。 通过观察手机接口的正负极分布，我们可以确定充电线的正负极。 需要注意的是，使用错误的充电线或不当的操作可能导致电池损坏、过热甚至引发火灾等风险。 先看看汽车上车载充电器通电的位置，叫做 点烟器。 图中可以看出最底部的凸点是车载充电器的输入正极，内壁均为输入负极。
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