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+//chapter 2
+//example 2.2
+//page 34
+clear;
+clc ;
+//given
+If=30;//forward current through diode in mA
+Es=5;//supply voltage in volts
+Ef=5;//when If=0 from equation Ef=Es-If*Rl
+deltaEf=2;// from load line
+deltaIf=0.015;//in ampere
+Rl=deltaEf/deltaIf;//load resistance in ohm
+printf('load resistance is %d ohm',Rl)