电源电动势的方向规定为在电源内部哪端到哪端;而电压方向规定为哪端指向哪端? 电压和电动势有何区别？它们的方向是如何规定的？
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http://baike.baidu.com/link?url=lMv2GOUo2PPqm8Bfh5zc4aXLZ0gkTOzcJdeQqAX9cfOE-K0XlosLTjt2lK2Jfyy_QO4caZNau2eOoBi5z0Qkra
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http://wenku.baidu.com/view/1a26938d8762caaedd33d4bc.html
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电动势是从负极指向正极的，而电压方向与其相反
电源内部 负极指向正极
外部 正指向负
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