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附圖的電路圖中,每個燈泡及電池皆相同,若圖中ad間的電壓為4.5伏特,通過bc燈泡的電流為1安培,則下列何者正確?
bc間的電壓為1.5伏特
eg間的電壓為4.5伏特
ad間的電流為3安培
fg間的電流為1安培
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