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二、電動勢 如圖 1-3 所示,若要使得水能持續流動,則需要幫浦對水作 功,將水由低重力位能處移至高重力位能處;同理,如圖 1-4 所 示,為了使電流能在迴路中持續流動,則需要電池在電路中扮 演「電荷幫浦」的角色,藉由對電荷作功,將電荷由低電位能 處移至高電位能處 NOTE4。 圖1-3 幫浦推動水流的示意圖。 圖1-4 
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owner: kkk60 - (no access) - 高中選修物理Ⅴ-9607B(01) (1).pdf, p7


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