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零欧姆电阻又称为跨接电阻器，是一种特殊用途的电阻，零欧姆电阻并非真正的阻值为零，欧姆电阻实际是电阻值很小的电阻。
电路板设计中两点不能用印刷电路连接，常在正面用跨线连接，这在普通板中经常看到，为了让自动贴片机和自动插件机正常工作，用零电阻代替跨线。
在电路中没有任何功能，只是在PCB上为了调试方便或兼容设计等原因。
可作跳线使用，避免用跳针造成的高频干扰(成为天线)。
在匹配电路参数不确定的时候，以零欧姆代替，实际调试的时候，确定参数，再以具体数值的元件代替。
零欧姆电阻可以承受多少电流?
设计电路经常要用零欧姆电容，一般根据线路电流来选择电阻额定功率，那零欧姆一般选多少合适?
一般的零欧姆电阻的实际阻值在50毫欧左右+-5%的偏差。所以根据额定功率，你就可以计算出来，它的额定电流了。
0402 1/16W：1/16=I*I*0.05 即I=1.118A
0603 1/8W：1/8=I*I*0.05 即I=1.58A
0805 1/4W：1/4=I*I*0.05 即I=2.236A
对于每种封装的零欧姆电阻具体可以通过多大的电流，还需要根据电阻在PCB板上的散热情况来决定。
下面分别测试了0603、0805、1206三种封装下，通过的电流和电阻两端之间的电压的关系。可以看到三种封装的电阻都在电流实际超过6A之后，电压开始快速上升。
测试零欧姆电阻最大流经电流：
测试示意图
这说明电阻的温度也急剧增加，导致功耗也大幅度增加。0603电阻在电流增加到11.5A时烧毁，0805电阻在电流增加到12A时烧断，1206的电阻在12A时没有烧毁。
0603封装零欧姆电阻电流与电压之间的曲线
0805封装零欧姆电阻电流与电压之间的曲线
1206封装零姆电阻电流与电压之间的曲线
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