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+// find average LED current
+// Electronic Principles
+// By Albert Malvino , David Bates
+// Seventh Edition
+// The McGraw-Hill Companies
+// Example 5-15, page 170
+
+clear;clc; close;
+	
+// Given data
+f=60;// frequency in hertz
+C=0.68*10^-6;// capacitance in faradays
+V=170;// voltage in volts
+
+// Calculations
+Xc=1/(2*%pi*f*C);// capacitive resistance in ohms
+Is1=V/Xc;// peak current in amperes
+Is2=Is1/%pi;// average of the half-wave currnt through LED
+disp("Amperes",Is2,"average LED current =")
+
+// Result
+// Average LED current is 13.9 mAmperes 
+
diff --git a/317/CH5/EX5.15/example15.txt b/317/CH5/EX5.15/example15.txt
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+Average LED current is 13.9 mAmperes