initial commit / add all books

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diff --git a/431/CH2/EX2.18/EX2_18.sce b/431/CH2/EX2.18/EX2_18.sce
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+//calculating resistance required in series

+//Chapter 2

+//Example 2.18

+//page 124

+clear;

+clc; 

+disp("Example 2.18")

+V=230;                    //voltage supply in volts

+Ia=20;                    //armature current in amperes

+Ra=0.5;                    //armature resistance in ohms

+E=V-(Ia*Ra);

+printf("E=%dV",E)

+disp("when extra resistance is added in the armature circuit,the speed is halved")

+E2=E/2;

+R=((V-E2)/Ia)-Ra;

+disp("The load torque is conatant")

+printf("extra resistance in the armature circui,R=%fohms",R)

+disp("The load torque directly proportional to square of speed")

+disp("if N is halfed, Iais one-fourthed")

+Ia2=Ia/4;

+R=((V-E2)/Ia2)-Ra;

+printf("extra resistance in the armature circui,R=%fohms",R)

+

+

+

+

diff --git a/431/CH2/EX2.18/resultEX2_18.txt b/431/CH2/EX2.18/resultEX2_18.txt
new file mode 100755
index 000000000..28ab354a8
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+  

+ Example 2.18   

+E=220V 

+ when extra resistance is added in the armature circuit,the speed is halved   

+ 

+ The load torque is conatant   

+extra resistance in the armature circui,R=5.500000ohms 

+ The load torque directly proportional to square of speed   

+ 

+ if N is halfed, Iais one-fourthed   

+extra resistance in the armature circui,R=23.500000ohms 
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