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diff --git a/3890/CH1/EX1.1/EX1_1.png b/3890/CH1/EX1.1/EX1_1.png
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diff --git a/3890/CH1/EX1.1/EX1_1.sce b/3890/CH1/EX1.1/EX1_1.sce
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+//Electric machines and power systems by Syed A Nasar
+//Publisher:Tata McGraw Hill
+//Year: 2002 ; Edition - 7 
+//Example 1.1
+//Scilab Version : 6.0.0    ; OS : Windows
+
+clc;
+clear;
+
+pi=900;                //input power during on period in watts
+ton=20;                //on period in minutes
+toff=40;               //off period in minutes
+
+E=(pi*ton*60+0*toff*60);     //energy consumed per hour in w s
+p_av=E/(60*60);              //the average power in watts
+
+printf('the energy consumed per hour is %d in w-s\n',E)
+printf('the average power is %d in watts\n',p_av)
+
+
diff --git a/3890/CH1/EX1.2/Ex1_2.png b/3890/CH1/EX1.2/Ex1_2.png
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diff --git a/3890/CH1/EX1.2/Ex1_2.sce b/3890/CH1/EX1.2/Ex1_2.sce
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+//Electric machines and power systems by Syed A Nasar
+//Publisher:TataMcgraw Hill
+//Year: 2002 ; Edition - 7 
+//Example 1.2
+//Scilab Version : 6.0.0    ; OS : Windows
+
+clc;
+clear;
+
+I1=60;              //current during duration 0 to 10 sec in Ampere
+t1max=10;t1min=0;              //time taken by current I1 in sec
+I2=25;              //current during duration 10 to 30 sec in Ampere
+t2max=30;t2min=10;              //time taken by current I2 in sec
+I3=50;              //current during duration 30 to 40 sec in Ampere
+t3max=40;t3min=30;              //time taken by current I3 in sec
+I4=-40;              //current during duration 45 to 40 sec in Ampere
+t4max=45;t4min=40;              //time taken by current I4 in sec
+I5=-20;              //current during duration 60 to 45 sec in Ampere
+t5max=60;t5min=45;              //time taken by current I5 in sec
+I6=0;              //current during duration 100 to 60 sec in Ampere
+t6max=100;t6min=60;              //time taken by current I6 in sec
+
+T=100;                                  //total time period in sec
+sa=(I1*(t1max-t1min))+(I2*(t2max-t2min))+(I3*(t3max-t3min))+(I4*(t4max-t4min))+(I5*(t5max-t5min))+(I6*(t6max-t6min));    //algebric sum of area under positive and negative currents in A s
+avg=sa/T;                                    //average value of current in ampere
+rms=((1/T)*((I1^2)*(t1max-t1min)+(I2^2)*(t2max-t2min)+(I3^2)*(t3max-t3min)+(I4^2)*(t4max-t4min)+(I5^2)*(t5max-t5min)+(I6^2)*(t6max-t6min)))^(1/2);
+
+printf('the average value of current waveform is %f in Ampere\n',avg)
+printf('the rms value of current waveform is %f in ampere\n',rms)
+