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diff --git a/1223/CH8/EX8.3/Ex8_3.sce b/1223/CH8/EX8.3/Ex8_3.sce
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+clear;
+clc;
+//Example 8.3
+Rcsnk=1;//degree celsius per watt
+Rsamb=5;//degree celsius per watt
+Tjmax=175;//maximum junction temperature
+Toc=25;
+Tamb=25;
+Pr=20;//rated power W
+Rdcase=(Tjmax-Toc)/Pr;
+printf('\ndevice to case thermal resistance=%.2f °C/W\n',Rdcase)
+P=(Tjmax-Tamb)/(Rdcase+Rcsnk+Rsamb);
+printf('\nmaximum power dissipation=%.2f W\n',P)