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diff --git a/1223/CH2/EX2.5/Ex2_5.sce b/1223/CH2/EX2.5/Ex2_5.sce
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+clear;
+clc;
+//Example 2.5
+rZ=4;//(Ohm) Zener resistance
+V_Lnom=9;//(V) nominal output voltage
+Izmax=0.3;//(A) maximum zener diode current
+Izmin=0.03;//(A) minimum zener diode current
+V_Lmax=V_Lnom+Izmax*rZ
+V_Lmin=V_Lnom+Izmin*rZ
+//percent regulation R
+R=((V_Lmax-V_Lmin)/V_Lnom)*100;
+printf('\npercent regulation=%0.1f \n',R)