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clear//
//Variables
IZmin = 0 //Minimun Zener current (in Ampere)
ILmax = 2.0 //Maximum load current (in Ampere)
VL = 12.0 //Voltage across load (in volts)
VSmin = 15.0 //Minimum Input voltage (in volts)
VSmax = 20.0 //Maximum Input Voltage (in volts)
beta = 100 //common emitter current gain
VBE = 0.5 //Voltage between base-emitter junction (in volts)
VZ = 12.5 //Voltage across zener diode (in volts)
IZmin = 1.0 * 10**-3 //Current through Zener diode
ICmax = ILmax //Maximum Collector current (in Ampere)
//Calculation
IBmax = ICmax / beta //Maximum collector current
IR = IBmax + IZmin //Current through resistance R (in Ampere)
Rmax = (VSmin - VZ)/ IR //Maximum value of resistance R (in ohm)
IZmax = (VSmax - VZ)/ Rmax //Maximum value of Zener current (in Ampere)
PZmax = VZ * IZmax //Maximum power dissipation in Zener Diode (in watt)
PRmax = (VSmax - VZ) * IZmax //Maximum power dissipated in Resistance R (in watt)
VCEmax = VSmax - VL //Maximum value of collector-to-emitter voltage (in volts)
PDmax = VCEmax * ILmax //Maximum power dissipation of the transistor (in watt)
//Result
printf("\n Maximum value of R is %0.0f ohm.\nMaximum power dissipation of the zener diode is %0.2f W.\nMaximum power dissipation of resistance R is %0.2f W.\nMaximum power dissipation of the transistor is %0.3f W.",Rmax,PZmax,PRmax,PDmax)
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