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//chapter9
//example9.22
//page172
Ei=12 // V
Vz=7.2 // V
Eo=Vz
Iz_min=10d-3 // A
Il_max=100d-3 // A
// we see that R=(Ei-Eo)/(Iz-Il) and minimum Iz occurs when Il is maximum so
R=(Ei-Eo)/(Iz_min+Il_max)
printf("required series resistance = %.3f ohm \n",R)
// on inserting this series resistance the output voltage will remain constant at 7.2 V
// the accurate answer is 43.636 ohm but in book it is given as 43.5 ohm
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