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clear//
//Variables
VSmin = 19.5 //Minimum source voltage (in volts)
VSmax = 22.5 //Maximum source voltage (in volts)
RL = 6.0 * 10**3 //Load resistance (in ohm)
VZ = 18.0 //Zener voltage (in volts)
IZmin = 2.0 * 10**-6 //Minimum zener current (in Ampere)
PZmax = 60.0 * 10**-3 //Maximum power dissipation (in watt)
rZ = 20.0 //Zener resistance (in ohm)
VL = VZ //Voltage across load resistance (in volt)
//Calculation
IZmax = (PZmax / rZ)**0.5 //Maximum value of zener current (in milli-Ampere)
IL = VL / RL //Load current (in milli-Ampere)
RSmax = (VSmin - VZ) / (IZmin + IL) //Maximum value of regulating resistance (in kilo-ohm)
RSmin = (VSmax - VZ) / (IZmax + IL) //Minimum value of regulating resistance (in kilo-ohm)
//Result
printf("\n Magnitude of regulating resistance should be between %0.1f ohm and %0.0f ohm.",RSmin,RSmax)
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