稳压二极管稳压电路如图18-18所示,已知u=28.2sinwtV,稳压二极管的稳压值U Z =6V,R L =2kΩ,R=1.2kΩ。试求:(1)S 1 断开,S 2 合上时的I o ,I R 和I Z ;(2)S 1 和S 2 均合上时的I o ,I R 和I Z ,并说明R=0和D Z 接反两种情况下电路能否起稳压作用。
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