问题描述：
关于电动势的理解（英文课本上的一句话不太懂）
在SAT 2物理上看到这样一句话,是讲电动势的,不是很理解.
The term electromotive force or emf is used only when energy is put into a circuit.Potential difference is often referred to as voltage when energy is removed.
在SAT 2物理上看到这样一句话,是讲电动势的,不是很理解.
The term electromotive force or emf is used only when energy is put into a circuit.Potential difference is often referred to as voltage when energy is removed.
问题解答：
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