电路如图7-49所示，已知R1=R2=2kΩ，R3=3kΩ,VD为理想二极管，电流I为（）mA。 A.0.75 B.0 C.1 D.3

作者: tihaiku 人气: - 评论: 0

问题电路如图7-49所示，已知R1=R2=2kΩ，R3=3kΩ,VD为理想二极管，电流I为（）mA。

选项 A.0.75 B.0 C.1 D.3

答案 A

解析正确答案是A。提示：利用戴维宁定理，将左边两条支路化简为具有内阻的电压源，然后计算电流I。

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