额定电流是指导体可连续承载的最大电流[1]，电流以安培为单位。导体的额定电流取决于自身在不损坏的情况下散热的能力。所有常见的导体对电流都有一定的阻力。电流流过导体时会导致电压下降和功率耗散，从而使导体发热。
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