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-{
- "metadata": {
- "name": "",
- "signature": "sha256:ea707a0cc7de0224e885823c97ef777e5b813dde41f39951ee0ed1ad37c83a74"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "Chapter7 - Low, High and Precise Resistance Measurements"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.1 - page7-24"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Resistance\n",
- "#Given data :\n",
- "R1=5.0 # in kohm\n",
- "R2=7.0 # in kohm\n",
- "R3=10.0 # in kohm\n",
- "Rx=(R2*R3)/R1 \n",
- "print \"Unknown resistance, Rx = \", Rx,\" kohm\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Unknown resistance, Rx = 14.0 kohm\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.2 - page7-24"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Current\n",
- "#Given data :\n",
- "R1=1.5 # in kohm\n",
- "R2=3.0 # in kohm\n",
- "R3=5.0 # in kohm\n",
- "R4=14.0 #in kohm\n",
- "Rg=250.0 #in ohm\n",
- "E=10.0 #in V\n",
- "Vd=(E*R4)/(R2+R4) \n",
- "Vc=(E*R3)/(R1+R3) \n",
- "E_th=E*((R4/(R2+R4))-(R3/(R1+R3))) \n",
- "R_th=((R1*R3)/(R1+R3))+((R2*R4)/(R2+R4)) \n",
- "Ig=(E_th/((R_th*10**3)+Rg))*10**6 \n",
- "print \"Current, Ig = \",round(Ig,2),\" micro A\"\n",
- "# answer is wrong in book\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Current, Ig = 140.15 micro A\n"
- ]
- }
- ],
- "prompt_number": 4
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.3 - page7-26"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Deflection\n",
- "#Given data :\n",
- "s=8 #sensivity in mm/micro A\n",
- "R1=1.0 # in kohm\n",
- "R2=5.0 # in kohm\n",
- "R3=2.0 # in kohm\n",
- "R4=10.0 #in kohm\n",
- "Rg=150.0 #in ohm\n",
- "E=6.0 #in V\n",
- "r=10.0 # unbalance resistance in ohm\n",
- "del_r=10.0 # in kohm\n",
- "R4_1=((R4*10**3)+r)*10**-3 \n",
- "Vd=(E*R4_1)/(R2+R4_1) \n",
- "Vc=(E*R3)/(R1+R3) \n",
- "E_th=E*((R4_1/(R2+R4_1))-(R3/(R1+R3))) \n",
- "R_th=((R1*R3)/(R1+R3))+((R2*R4)/(R2+R4)) \n",
- "Ig=(E_th/((R_th*10**3)+Rg))*10**6 \n",
- "d=Ig*s #deflection in mm\n",
- "print \"Deflection is \",round(d,1), \" mm\"\n",
- "#answer is wrong in the textbook\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Deflection is 2.6 mm\n"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.4 - page7-28"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Current\n",
- "#Given data :\n",
- "R=500.0 #in ohm\n",
- "Rg=150.0 # in ohm\n",
- "del_r=10.0 # in ohm\n",
- "E=6.0 #in V\n",
- "E_th=(E*del_r)/(4*R) \n",
- "R_th=R \n",
- "Ig=(E_th/(R_th+Rg))*10**6 \n",
- "print \"Current, Ig = \", round(Ig,3), \"micro A\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Current, Ig = 46.154 micro A\n"
- ]
- }
- ],
- "prompt_number": 9
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.5 page7-29"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Supply voltage\n",
- "#Given data :\n",
- "R=120.0 #in ohm\n",
- "del_r=1.0 # in ohm\n",
- "E_th=10*10**-3 #in V\n",
- "E=(E_th*4*R)/del_r \n",
- "print \"Supply voltage, E = \", E,\" V\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Supply voltage, E = 4.8 V\n"
- ]
- }
- ],
- "prompt_number": 10
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.6 - page7-30"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Resistance\n",
- "#Given data :\n",
- "A=100.24 # in ohm\n",
- "B=200.0 # in ohm\n",
- "a=100.31 # in ohm\n",
- "b=200.0 # in ohm\n",
- "S=100.03 # in micro ohm\n",
- "r=700.0 # in micro ohm\n",
- "X=((A/b)*S)+(((r*b)/(r+a+b))*((A/B)-(a/b))) \n",
- "print \"Unknown resistance, X = \", round(X,2), \"micro ohm\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Unknown resistance, X = 50.09 micro ohm\n"
- ]
- }
- ],
- "prompt_number": 12
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.7 - page7-31"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Deflection\n",
- "#Given data :\n",
- "R_ab=100.0 # in ohm\n",
- "R_bc=500.0 # in ohm\n",
- "R_cd=1000.0 # in ohm\n",
- "R_da=200.0 # in ohm\n",
- "V=10.0 \n",
- "VRg=200. # in ohm\n",
- "del_CD=10.0 # in ohm\n",
- "V_bd=V*((R_ab/(R_ab+R_bc))-(R_da/(R_da+R_cd+del_CD))) \n",
- "R_bd=(((R_ab*R_bc)/(R_ab+R_bc))+((VRg*(R_cd+del_CD))/(VRg+R_cd+del_CD))) \n",
- "I_G=(V_bd/(R_bd+VRg)) \n",
- "s=5 #sensivity in micro A/mm\n",
- "dg=I_G*10**6*s #deflection in mm\n",
- "print \"Deflection is \",round(dg,0),\" mm\"\n",
- "#answer is wrong in the textbook"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- " Deflection is 153.0 mm\n"
- ]
- }
- ],
- "prompt_number": 15
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.8 - page7-32"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#LIMITING VALUE OF RESISTANCE\n",
- "P=100.0 #OHMS\n",
- "Q=P \n",
- "S=230.0 #IN ohm\n",
- "DP=0.02 #ERROR IN PERCENTAGE\n",
- "DS=0.01 #IN PERCENTAGE\n",
- "R=(P/Q)*S #unknown resistance in ohms\n",
- "dr=(DP+DP+DS) #relative limiting error in unknow resistance in percentage \u00b1\n",
- "drm=(dr/100)*R #magnitude of error\n",
- "R1=R+drm #in ohms\n",
- "R2=R-drm #in ohms\n",
- "print \"Limiting value of unknow resistance is \", R2, \" ohm to \", R1, \" ohm\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Limiting value of unknow resistance is 229.885 ohm to 230.115 ohm\n"
- ]
- }
- ],
- "prompt_number": 17
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.9 - page7-33"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "import math\n",
- "#Insulation resistance of cable\n",
- "t=120.0 #in seconds\n",
- "v1=300.0 #in volts\n",
- "v2=100.0 #in volts\n",
- "c=300.0 #capacitance in pf\n",
- "r=t/(c)/math.log(v1/v2)#resistance in Mohm\n",
- "print \"Resistance of cable is \", round(r,3),\" Mohm\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Resistance of cable is 0.364 Mohm\n"
- ]
- }
- ],
- "prompt_number": 19
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.10 - page7-33"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Resistance \n",
- "g=2000.0 #in ohms\n",
- "s=10.0 #in kohm\n",
- "q1=40.0 #divisions\n",
- "q2=46.0 #divisions\n",
- "r=((q1/q2)*((s*10**3)+(g)))-g #in ohms\n",
- "print \"Unknown resistance is \",round(r,2),\" ohm\"\n",
- "#answer is wrong in the textbook\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Unknown resistance is 8434.78 ohm\n"
- ]
- }
- ],
- "prompt_number": 21
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.11 - page7-34"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Resistance \n",
- "t=200.0 # in V\n",
- "i=0.5 #in A\n",
- "ra=10.0 #in ohm\n",
- "x=t/i #in ohm\n",
- "r=x-ra #in ohm\n",
- "print \"Unknown resistance is \",r,\" ohm\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Unknown resistance is 390.0 ohm\n"
- ]
- }
- ],
- "prompt_number": 22
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 7.5.12 - page7-34"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Ammeter and voltmeter readings\n",
- "t=200.0 # in V\n",
- "i=0.5 #in A\n",
- "ra=10.0 #in ohm\n",
- "x=t/i #in ohm\n",
- "r=x-ra #in ohm\n",
- "sv=10 #sensivity in kohms / V\n",
- "v=1000 #in V\n",
- "rv=v*sv *10**-6 # in Mohm\n",
- "rp=((rv*10**6)*r)/(rv*10**6+r) #in ohm\n",
- "vr=((t*rp)/(ra+rp)) #voltmeter reading in V\n",
- "vi=vr/rp #ammeter rading in A\n",
- "print \"Voltmeter reading is \",round(vr,2),\" V\"\n",
- "print \"Ammeter rading is \",round(vi,5),\" A\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Voltmeter reading is 194.81 V\n",
- "Ammeter rading is 0.51899 A\n"
- ]
- }
- ],
- "prompt_number": 27
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 06:41:14 +0000