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由P=UI=U²/R,得R=U²/P.25瓦燈泡電阻R1=U1²/P1=(220伏)²/25瓦=1936歐40瓦燈泡電阻R2=U2²/P2=(220伏)²/40瓦=1210歐串聯電路的總電阻R總=R1+R2=1936歐+1210歐=3146歐串聯電路的電...
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