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diff --git a/3515/CH3/EX3.18/Ex_3_18.sce b/3515/CH3/EX3.18/Ex_3_18.sce
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+ // Exa 3.18
+format('v',9);
+clc;
+clear;
+close;
+// Given data 
+VBE= 0.76;// in V
+VT= 0.025;// in V
+I_C= 10*10^-3;// in A
+// Formula I_C= I_S*%e^(VBE/VT)
+I_S= I_C/(%e^(VBE/VT));// in A
+disp(I_S,"The value of I_S in amp is : ")
+// Part(a) for VBE = 0.7 V
+VBE= 0.7;// in V
+I_C= I_S*%e^(VBE/VT)
+disp(I_C*10^3,"For VBE = 0.7 V , The value of I_C in mA is : ")
+
+// Part (b) for I_C= 10 µA
+I_C= 10*10^-6;// in A
+// Formula I_C= I_S*%e^(VBE/VT)
+VBE= VT*log(I_C/I_S);
+disp(VBE,"For I_C = 10 µA, The value of VBE in V is : ")