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+//pagenumber 138 example 1
+clear
+//zener diode
+voltag=5.2;//volts
+w=260*10^-3;//watts
+appv=15;//voltsw1=50;//watts
+imax=w/voltag*0.1;
+//to maitain a constant voltage
+imax1=(w/voltag)-imax;
+resmin=(appv-voltag)/(w/voltag);
+resmax=(appv-voltag)/imax1;
+//load 50
+resmax1=((9.8)/(45*10^-3))-50;
+resmin1=((9.8)/(50*10^-3))-50;
+res50=resmax1-resmin1;
+disp("resistance range from "+string(resmin)+" to "+string(resmax)+"ohms");
+disp("resistance range at 50 from "+string(resmin1)+" to "+string(resmax1)+"ohms");
+
+
+