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【单选题】
下面是对电源电动势概念的认识,你认为正确的是:A.
同一电源接入不同的电路,电动势就会发生变化
B.
1号1.5V干电池比7号1.5V干电池大,但电动势相同
C.
电动势表征了电源把其他形式能转化为电能的本领,电源把其他形式能转化为电能越多,电动势越大
D.
电动势、电压和电势差虽名称不同,但物理意义相同,所以单位也相同
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