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+clear//
+
+//Variables
+
+VS = 24.0 //Source voltage (in volts)
+RS = 500.0 //Series resistance (in ohm)
+VZ = 12.0 //Zener Voltage (in volts)
+IZmin = 3.0 //Minimum Zener current (in milli-Ampere)
+IZmax = 90.0 //Maximum Zener current (in milli-Ampere)
+rZ = 0.0 //Zener resistance (in ohm)
+
+//Calculation
+
+IS = (VS - VZ) / RS //Current through RS (in Ampere)
+ILmax = IS - IZmin * 10**-3 //Maximum value of load Current (in Ampere)
+RLmin = VZ / ILmax //Minimum value of Load resistance (in ohm)
+
+//Result
+
+printf("\n Minimum value of load resistance is %0.0f ohm.",RLmin)