下列关于电动势的说法，正确的是A．电源向外电路提供的电能越多

下列关于电动势的说法，正确的是

A．电源向外电路提供的电能越多，表示电动势越大

B．电动势在数值上等于电源将单位正电荷从负极移送到正极时，非静电力所做的功

C．电源的电动势与外电路有关，外电路电阻越大，电动势就越大

D．电动势越大的电源，将其他形式的能转化为电能的本领越大

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下列关于电动势的说法，正确的是A．电源向外电路提供的电能越多

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