电压降
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由于导体中的电阻，沿线缆长度产生的电压损失。
更细或更长的线缆具有更高阻抗，导致更多电压降。2米28AWG的USB线缆在负载下可能降压0.5V，显著降低充电速度。更粗的导体（更低AWG）和更短的线缆长度可最大程度减少电压降。USB PD通过协商更高初始电压来补偿。