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+// Scilab code Ex1.10: Pg 16 (2008)
+clc; clear;
+E = 12;        // E.m.f, V
+I = 5;         // Electric current, A
+V = 11.5;       // Terminal potential difference, V
+// Using relation V = E - I*r, solving for r
+r = ( E - V )/I;     // Internal resistance of battery, ohm
+// From Ohm's law, V = I*R, then solving for R
+R = V/I;              // Resistance, ohms
+printf("\nThe internal resistance of battery = %3.1f ohm", r)
+printf("\nThe resistance of external circuit = %3.1f ohm", R)
+
+// Result
+// The internal resistance of battery = 0.1 ohm
+// The resistance of external circuit = 2.3 ohm