From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 3507/CH9/EX9.21/Ex9_21.sce | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 3507/CH9/EX9.21/Ex9_21.sce

(limited to '3507/CH9/EX9.21')

diff --git a/3507/CH9/EX9.21/Ex9_21.sce b/3507/CH9/EX9.21/Ex9_21.sce
new file mode 100644
index 000000000..8d4c037ef
--- /dev/null
+++ b/3507/CH9/EX9.21/Ex9_21.sce
@@ -0,0 +1,28 @@
+//chapter9
+//example9.21
+//page171
+
+Vmax=120 // V
+Vmin=80 // V
+Vz=50 // V
+R_L=10 // kilo ohm
+R1=5 // kilo ohm
+
+// zener diode is on for Vmax and Vmin both since they are > Vz
+
+// for max Iz
+    V_R1=Vmax-Vz
+    I=V_R1/R1 // current through R1
+    I_L=Vz/R_L // current through load
+    // by Kirchoff first law I=I_L+Iz so applying it we get
+    Iz_max=I-I_L
+    
+// for min Iz
+    V_R1_dash=Vmin-Vz
+    I_dash=V_R1_dash/R1// current through R1
+    I_L_dash=Vz/R_L // current through load
+    // by Kirchoff first law I=I_L+Iz so we get
+    Iz_min=I_dash-I_L_dash
+    
+printf("maximum zener current = %.3f mA \n",Iz_max)
+printf("minimum zener current = %.3f mA \n",Iz_min)
-- 
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