漂移速度(Drift Velocity),是指一個粒子(例如電子)因為電場的關係而移動的平均速度。
因為電流和漂移速度成正比,經多番推導後可得出其量值亦和電場量值成正比例,當中的推導過程可以歐姆定律解釋。
漂移速度可以用以下公式表達:
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