电流
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流经线缆的电流量，以安培（A）为单位。
电流决定能量传输速度。USB-C线缆额定为3A或5A。带e-marker的5A线缆在20V电压下可提供高达100W功率。在100W充电器上使用3A线缆会出于安全考虑使充电器协商降至60W。