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diff --git a/863/CH3/EX3.1/Ex3_1.txt b/863/CH3/EX3.1/Ex3_1.txt
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+++ b/863/CH3/EX3.1/Ex3_1.txt
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+//Caption:Calculate (a)Resistance (b)Forward Current (c)Power dissipation (d)Peak Reverse Voltage
+//Ex:3.1
+clc;
+clear;
+close;
+e=50//Input voltage(in volts)
+i=20//Output Current(in mA)
+v=0.5//Output voltage(in volts)
+is=5//Reverse Leakage Current(in micro ampere)
+vf=0.7//Forward voltage of diode(in volts)
+R=v*1000/is
+disp(R,'(a)Resistance(in Kilo ohm)=')
+I=(e-vf)/R
+P=(e^2)/R
+if=i+I
+disp(if,'(b)Forward Current(in mA)=')
+p=vf*if
+disp(p,'(c)Power Dissipation(in mW)=')
+ep=-e
+disp(ep,'(d)Peak Reverse Voltage(in volts)=')
+\ No newline at end of file