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【单选题】
实际电压源模型与实际电流源模型之间能进行等效变换,对于它们之间的等效变换,下列叙述哪个是错误的()
A.
实际电源的相互等效，只对外特性等效，而电源内部是不等效
B.
当实际电压源模型转换为实际电流源模型时，等效电流源的 参考方向是由 电压源 的正极指向负极
C.
当实际电压源模型转换为实际电流源模型时，等效电流源的数值为
D.
实际电压源模型转换为实际电流源模型时，内阻保持不变
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