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先算出電流根據公式I=U/R得I=1000/220 I=0.22A 再算功率根據公式P=U*I得P=220*0.22 P=48.4W
數字萬用表最大量程2K檔,數字顯示為1.00指針萬用表X100檔,指針在數位10.
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