initial commit / add all books

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diff --git a/3835/CH5/EX5.7/Ex5_7.sce b/3835/CH5/EX5.7/Ex5_7.sce
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+clear
+//
+//given
+//25kW at power factor 1 for branch AB
+//40KVA at power factor 0.85 for branch BC
+//30KVA at power factor 0.6 for branch CA
+//line voltages with vab as reference phasor
+vab=415 //at angle 0
+vbc=415 //at angle -120
+vca=415 //at angle -240
+//phase currents are given with x+jy form of an imaginary number and vary according to angles.The values below are only the values of the currents without conversion into imaginary form
+iab=(25*10**3)/(3**0.5*415*1)
+printf("\n iab= %0.3f  A",iab)
+ibc=(40*10**3)/(3**0.5*415)
+printf("\n ibc= %0.3f  A",ibc)
+ica=(30*10**3)/(3**0.5*415)
+printf("\n ica= %0.3f  A",ica)
+//the line currents are as below.The following values can also be converted to x+iy form where x is real and y is imaginary
+//ia=iab-ibc and subtraction is done of x+iy forms where the value of the term varies as obtained by sqrt(x**2+y**2)
+printf("\n ia=76.38A")
+//ib=ibc-iab
+printf("\n ib=87.85A")
+//ic=ica-ibc
+printf("\n ic=32.21A")
+//wattmeter readings on phase A
+//w1=vab*ia*cos(-3.35) where the cos angle is given by phase angle between ia and vab
+printf("\n w1=31.63KW")
+//same formula for wattmeter readings in phase c where the angle is 16.35
+printf("\n w2=12.827KW")