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

---
 174/CH4/EX4.8/example4_8.sce | 31 +++++++++++++++++++++++++++++++
 174/CH4/EX4.8/example4_8.txt |  2 ++
 2 files changed, 33 insertions(+)
 create mode 100755 174/CH4/EX4.8/example4_8.sce
 create mode 100755 174/CH4/EX4.8/example4_8.txt

(limited to '174/CH4/EX4.8')

diff --git a/174/CH4/EX4.8/example4_8.sce b/174/CH4/EX4.8/example4_8.sce
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+// To find shunt and current limiting resistor
+// Modern Electronic Instrumentation And Measurement Techniques
+// By Albert D. Helfrick, William D. Cooper
+// First Edition Second Impression, 2009
+// Dorling Kindersly Pvt. Ltd. India
+// Example 4-8 in Page 70
+
+
+clear; clc; close;
+
+// Given data
+I_fsd = 10*(10^-3); // current for full scale deflection in ampere
+R_m = 5; //internal resistance of the d'Arsonval movement in ohm
+E = 3; //Battery voltage in volt
+R_h = 0.5; //The desired scale marking for the half scale deflection in ohm
+
+//Calculations
+I_m = 0.5 * I_fsd; // Current for half scale deflection of movement
+E_m = I_m * R_m; //The voltage across movement
+I_x = E_m / R_h; // Voltage across unknown resistor R_x
+I_sh = I_x - I_m; //As I_x = I_sh + I_m
+R_sh = E_m / I_sh;
+I_t = I_m +I_sh +I_x; //The total battery current
+R_1 = (E - E_m)/I_t; 
+printf("(a)  The value of the shunt resistor, R_sh = %0.3f ohm\n",R_sh);
+printf("(b)  The value of the current limiting resistor, R_1 = %0.2f ohm",R_1);
+
+//Result
+// (a)  The value of the shunt resistor, R_sh = 0.556 ohm
+// (b)  The value of the current limiting resistor, R_1 = 29.75 ohm 
+
diff --git a/174/CH4/EX4.8/example4_8.txt b/174/CH4/EX4.8/example4_8.txt
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+(a)  The value of the shunt resistor, R_sh = 0.556 ohm
+(b)  The value of the current limiting resistor, R_1 = 29.75 ohm 
-- 
cgit