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diff --git a/1223/CH1/EX1.5/Ex1_5.sce b/1223/CH1/EX1.5/Ex1_5.sce
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+++ b/1223/CH1/EX1.5/Ex1_5.sce
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+clear;
+clc;
+//Example 1.5
+T=300;//(°K)Given Temperature
+V_T=0.026;//(Volt)terminal voltage
+Is=10^-11;//(mA)reverse bias saturation current
+n=1;//emission coefficient
+v_D=+0.7;//(V)applied voltage
+//pn junction is forward biased
+i_D=Is*(exp(v_D/V_T)-1);//diode current
+printf('\ndiode current=%f mA\n',i_D)
+v_D=-0.7;//(V)pn junction is reverse biased
+Is=10^-14//A;
+i_D=Is*(exp(v_D/V_T)-1);//diode current
+printf('\ndiode current=%e A',i_D)