功率（W）
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能量传输速率，等于电压乘以电流（V x A = W）。
65W充电器比15W充电器传输能量更快。对于USB-C，功率取决于协商的电压和电流：5V下3A = 15W（手机），20V下5A = 100W（笔记本电脑），48V下5A = 240W（高性能笔记本电脑）。