一台发电机用1 A电流向外输电,在1 min内把360 J的机械能转化为电能

一台发电机用1 A电流向外输电,在1 min内把360 J的机械能转化为电能,这台发电机的电动势为(    )

A.6 V               B.360 V              C.12 V              D.220 V

答案

思路点拨:电动势在数值上等于非静电力把1 C的正电荷在电源内从负极移送到正极所做的功.本题1 min移送电荷1 A×60 s=60 C,利用E=W/q即可求出电动势.

答案:A

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