220V,100W的灯泡经一段导线接在220V的电源上.它的实际功率为81W,则导线上损耗的功率是多少?怎么计算?
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![220V,100W的灯泡经一段导线接在220V的电源上.它的实际功率为81W,则导线上损耗的功率是多少?怎么计算?](/uploads/image/z/3225586-58-6.jpg?t=220V%2C100W%E7%9A%84%E7%81%AF%E6%B3%A1%E7%BB%8F%E4%B8%80%E6%AE%B5%E5%AF%BC%E7%BA%BF%E6%8E%A5%E5%9C%A8220V%E7%9A%84%E7%94%B5%E6%BA%90%E4%B8%8A.%E5%AE%83%E7%9A%84%E5%AE%9E%E9%99%85%E5%8A%9F%E7%8E%87%E4%B8%BA81W%2C%E5%88%99%E5%AF%BC%E7%BA%BF%E4%B8%8A%E6%8D%9F%E8%80%97%E7%9A%84%E5%8A%9F%E7%8E%87%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E6%80%8E%E4%B9%88%E8%AE%A1%E7%AE%97%3F)
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