initial commit / add all books

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diff --git a/2459/CH27/EX27.2/Ex27_2.sce b/2459/CH27/EX27.2/Ex27_2.sce
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+//chapter27

+//example27.2

+//page575

+

+R1=4 // ohm

+R2=4 // ohm

+R3=4 // ohm

+

+// for h11 and h21, imagine that output terminals are shorted hence it is clear that input impedence is equal to R1+R2*R3/(R2+R3)

+    // this is h11 by definition so

+    h11=R1+R2*R3/(R2+R3)

+

+    // now current will divide equally at junction of 4 ohm resistors so output_current/input_current = -0.5

+    // but this ratio is h21 by definition. Thus

+    h21=-0.5

+

+// for h12 and h22 imagine a voltage source on output terminals

+    // this voltage will be divided by a factor 2

+    // hence input_voltage/output_voltage = 0.5

+    // but this ratio is h12 by definition. Thus

+    h12=0.5

+

+    // here output impedence looking into output terminals with input terminals open is 8 ohm.

+    // its reciprocal is h22 by definition. Thus

+    h22=1/8

+    

+printf("h11 = %.3f ohm \n",h11)

+printf("h21 = %.3f \n",h21)

+printf("h12 = %.3f \n",h12)

+printf("h22 = %.3f ohm \n",h22)

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