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+// Find maximum value of ac voltage
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 3-13 in page 160
+
+clear; clc; close;
+
+// Given data
+Vdc=30; // DC voltage in V
+Rf=25; // Internal resistance in ohms
+Rl=500; // Load resistance in ohms
+
+// Calculation
+Idc=Vdc/Rl;
+Im=%pi*Idc;
+Vi=Im^2*(Rf+Rl);
+printf("Voltage required at the input = %0.2f V",Vi);
+
+// Result
+// Voltage required at the input is = 18.65 V
+\ No newline at end of file
diff --git a/181/CH3/EX3.13/example3_13.txt b/181/CH3/EX3.13/example3_13.txt
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+Voltage required at the input is = 18.65 V
+\ No newline at end of file