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   "source": [
    "## Chapter 6:POWER AND POWER FACTOR"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex6.1:pg-229"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
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   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "115.69 =Average Power is(in watts)\n"
     ]
    }
   ],
   "source": [
    "#Example 6_1 page no:229\n",
    "import math \n",
    "phase_angle=30#phase angle in degree\n",
    "Vm=100#maximum voltage\n",
    "Veff=100.0/math.sqrt(2)\n",
    "Ieff=15/math.sqrt(2)\n",
    "Pav=Veff*Ieff*math.cos(phase_angle)\n",
    "print round(Pav,2),\"=Average Power in watts\"\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex6.2:pg-230"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "62.5 =Average power in watts\n"
     ]
    }
   ],
   "source": [
    "#Example 6_2 page no:230\n",
    "import numpy\n",
    "Z=5+8j\n",
    "Im=5#maximum current\n",
    "Pav=Im**2*numpy.real(Z)/2\n",
    "print Pav,\"=Average power in watts\"\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex6.3:pg-231"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "625.0 =Apparent Power in VA\n",
      "-0.918 =Power Factor \n",
      "-573.927 =Average Power in watts\n"
     ]
    }
   ],
   "source": [
    "#Example 6_3 page no:231\n",
    " \n",
    "theta=53\n",
    "Vm=50#peak voltage\n",
    "Im=25#peak current\n",
    "Veff=Vm/math.sqrt(2)\n",
    "Ieff=Im/math.sqrt(2)\n",
    "Papp=Veff*Ieff\n",
    "print Papp,\"=Apparent Power in VA\"\n",
    "print round(math.cos(theta),3),\"=Power Factor \"\n",
    "Pav=Veff*Ieff*math.cos(theta)\n",
    "print round(Pav,3),\"=Average Power in watts\"\n",
    "#value of power factor is rounded off in text book so value vary slightly\n"
   ]
  }
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