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【单选题】
如图所示 ,直线A为电源的U - I图线,直线B和C分别为电阻R 1 和 R 2 的 U - I图线,用该电源分别与R 1 ,R 2 组成闭合电路时 ,电源的输出功率分别为P 1 ,P 2 ,电源的效率分别为η 1 ,η 2 ,则( )
A.
η 1 2
B.
η 1 >η 2
C.
P 1 < P 2
D.
P 1 > P 2
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