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//Book Name:Fundamentals of Electrical Engineering
//Author:Rajendra Prasad
//Publisher: PHI Learning Private Limited
//Edition:Third ,2014
//Ex1_11.sce.
clc;
clear;
R=10; //resistance in ohms
L=5; //inductance in henry
V=100; //supply voltage in volts
t1=2; //time at which k1 switch opened in seconds
//CASE1
printf("\n (a)")
i=(V*(1-exp(-((R*t1)/L))))/R;
printf("\n The inductive current at the time k1 is opened=%1.2f A",i)
//CASE2
printf("\n (b)")
v1=V*exp(-((R*t1))/L);
printf("\n The voltage across the inductor at t=2second=%1.2f V",v1)
//CASE3
printf("\n (c)")
t2=3; //time in seconds
Imax=(V/R);
v2=Imax*R*(exp(-((R*t2))/L));
printf("\n The voltage across the inductor at t=3 second=%1.4f V",v2)
//For v2 calculation ,the answer in the book is wrong
//CASE4
printf("\n (d)")
t3=0; //initial time in seconds
it=(-R*(-Imax)*exp(-(R*t3)/L))/L; //rate of decay of inductor current in amphere per seconds
printf("\n The initial value of rate of decay of inductor current=%d A/s",it)
//CASE5
printf("\n (e)")
Energy=(1/2)*L*Imax^2;
printf("\n The energy dissipated in the resistor=%d J",Energy)
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