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交變電流的有效值是根據電流的熱效應來規定的.讓交流和直流分別通過相同阻值的電阻,如果它們在相同時間內產生的熱量相等,就把這一直流的數值叫作這一交流的有效值.即用與交變電流有相同熱效應的直流來等效替代交變電…
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