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+// Calculate surge current & I2t ratings
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 8-7 in page 379
+
+clear; clc; close;
+
+// Given Data
+ish=3000; // half cycle surge current rating of SCR in A
+f=50; // Frequency of operation of supply in Hz
+
+// Calculations
+I=ish*sqrt(2*f)/sqrt(4*f); 
+I2t_rate=(I*I)/(2*f); 
+
+printf("(a)The surge current rating of one cycle for the SCR is %0.2f A \n",I);
+printf("(b)The I2t rating of one cycle for the SCR is %0.2f A^2-second \n",I2t_rate);
+
+// Results
+// (a) The surge current rating of one cycle for the SCR is 2121.32 A
+// (b) The I2t rating of one cycle for the SCR is 45000 A^2-second
+\ No newline at end of file