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diff --git a/1754/CH3/EX3.12/Exa3_12.sce b/1754/CH3/EX3.12/Exa3_12.sce
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+//Exa 3.12
+clc;
+clear;
+close;
+//Given data : 
+VCC=20;//in volt
+RC=20;//in ohm
+VCEQ=10;//in volt
+ICQ=500;//in mA
+//part (i) :
+Pin_dc=VCC*ICQ*10^-3;//in watt
+disp(Pin_dc,"Total dc power taken by the circuit in Watt : ");
+//part (ii) :
+PRc_dc=ICQ^2*10^-6*RC;//in watt
+disp(PRc_dc,"dc power dissipated by the collector load in Watt : ");
+//part (iii) :
+Io=250;//in mA(maximum value of output ac current)
+Irms=Io/sqrt(2);//in mA
+Po_ac=Irms^2*10^-6*RC;//in watt
+disp(Po_ac,"Power developed across the load in Watt : ");
+//part (iv) :
+Ptr_dc=Pin_dc-PRc_dc;//in watt
+disp(Ptr_dc,"dc power dissipated by the collector load in Watt : ");
+//part (v) :
+PC_dc=Pin_dc-PRc_dc-Po_ac;//in watt
+disp(PC_dc,"dc power dissipated by the collector load in Watt : ");
+//part (vi) :
+ETAoverall=Po_ac*100/Pin_dc;//Overall Efficiency (in %)
+disp(ETAoverall,"Overall Efficiency (in %) :");
+//part (vii) :
+ETAcollector=Po_ac*100/PRc_dc;//Collector Efficiency (in %)
+disp(ETAcollector,"Collector Efficiency (in %) :");
+\ No newline at end of file