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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Chapter 6:POWER AND POWER FACTOR"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex6.1:pg-229"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "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"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}