游客 113.99.84.x 发表于 2017-1-18 10:30 O欧姆的电阻也是有内阻的,就是几十毫欧(假定50毫欧)的样子,P=I方*r=0.5*0.5*0.05=0.0125W,再和相应的封 ...
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