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額定電流是指導體可連續承載的最大電流[1]，電流以安培為單位。導體的額定電流取決於自身在不損壞的情況下散熱的能力。所有常見的導體對電流都有一定的阻力。電流流過導體時會導致電壓下降和功率耗散，從而使導體發熱。
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