Consider the Zener voltage regulator shown in the figure below.The zener diode has
Vz=10V,Iz(min)=5mAandIz(max)=24mA.
The range of value of the load current IL is
Iin=Vin−VZ1k=40−201k=30 mA
Iin=IZ+IL
IL(min)=Iin−IZ(max)=30−24=6 mA
IL(max)=Iin−IZ(min)=30−5=25 mA