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  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 11: Measurement of Voltages and Currents"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.1, Page 209"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Initialisation\n",
      "t=0.02                   #time period in seconds from diagram\n",
      "v1=7                     #peak voltage from diagram\n",
      "\n",
      "\n",
      "#Calculation\n",
      "f=1*t**-1               #frequency in Hz\n",
      "v2=2*v1                 # Peak to Peak Voltage\n",
      "\n",
      "#Result\n",
      "print'Frequency = %d Hz\\n'%f\n",
      "print'Peak to Peak Voltage = %d V\\n'%v2\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Frequency = 50 Hz\n",
        "\n",
        "Peak to Peak Voltage = 14 V\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.2, Page 210"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "#Initialisation\n",
      "t=0.05                   #time period in seconds from diagram\n",
      "v1=10                     #peak voltage from diagram\n",
      "\n",
      "\n",
      "#Calculation\n",
      "f1=1*t**-1               #frequency in Hz\n",
      "w1=2*math.pi*f1          #Angular velocity\n",
      "\n",
      "#Result\n",
      "print'%d sin %.1ft Hz\\n'%(v1,w1)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "10 sin 125.7t Hz\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 26
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.3, Page 211"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "#Initialisation\n",
      "t=0.1                   #time period in seconds from diagram\n",
      "v1=10                     #peak voltage from diagram\n",
      "t1=25*10**-3\n",
      "\n",
      "#Calculation\n",
      "f1=1*t**-1               #frequency in Hz\n",
      "w1=2*math.pi*f1          #Angular velocity\n",
      "phi=-(t1*t**-1)*360      #phase angle\n",
      "\n",
      "#Result\n",
      "print'phi = %d degree'%phi\n",
      "print'%d sin %dt%d Hz\\n'%(v1,round(w1),phi)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "phi = -90 degree\n",
        "10 sin 63t-90 Hz\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 24
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.4, Page 215"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "#Initialisation\n",
      "v1=5                                 #constant 5V\n",
      "r=10                                #resistance in Ohm\n",
      "vrms=5                              #sine wave of 5 V r.m.s\n",
      "vp=5                                #5 V peak\n",
      "\n",
      "#Calculation\n",
      "p=(v1**2)*r**-1                      #Power in watts\n",
      "p2=(vrms**2)*r**-1                   #Power avarage in watts\n",
      "a=(vp*math.sqrt(2)**-1)**2\n",
      "p3=a*r**-1                           #Power avarage in watts                         \n",
      "\n",
      "#Result\n",
      "print'(1) P = %.1f W\\n'%p\n",
      "print'(2) Pav = %.1f W\\n'%p2\n",
      "print'(3) Pav = %.2f W\\n'%p3"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "(1) P = 2.5 W\n",
        "\n",
        "(2) Pav = 2.5 W\n",
        "\n",
        "(3) Pav = 1.25 W\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 27
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.5, Page 220"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Initialisation\n",
      "fsd1=50*10**-3                #full scale defelction of ammeter in Ampere\n",
      "fsd2=1*10**-3                 #full scale defelction of moving coil meter in Ampere\n",
      "Rm=25                         #resistance of moving coil meter in Ohms\n",
      "\n",
      "#Calculation\n",
      "Rsm=fsd1*fsd2**-1             #sensitivity factor\n",
      "Rsh=Rm*49**-1                 #shunt resistor\n",
      "\n",
      "#Result\n",
      "print'Therefore, Resistor = %d mOhm\\n'%round(Rsh*10**3)\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Therefore, Resistor = 510 mOhm\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 10
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.6, Page 222"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Initialisation\n",
      "fsd1=50                       #full scale defelction of voltmeter in Volts\n",
      "fsd2=1*10**-3                 #full scale defelction of moving coil meter in Ampere\n",
      "Rm=25                         #resistance of moving coil meter in Ohms\n",
      "\n",
      "#Calculation\n",
      "Rsm=fsd1*fsd2**-1\n",
      "Rse=Rsm-Rm\n",
      "\n",
      "#Result\n",
      "print'Rse = %.3f KOhm\\n'%(Rse*10**-3)\n",
      "print'Therefore, Resistor ~ %d KOhm\\n'%round(Rse*10**-3)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Rse = 49.975 KOhm\n",
        "\n",
        "Therefore, Resistor ~ 50 KOhm\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}