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【单选题】
一硅稳压压电路如图所示。其中未经稳压的直流输入电压 V I =18V , R=1k Ω , R L =2k Ω ,硅稳压管 D Z 的稳定电压 V Z =10V ,动态电阻及未被击穿时的反向电流均可忽略。试求 I o 的值.A.
8mA
B.
3mA
C.
5mA
D.
0mA
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