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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# CHAPTER_8-Load Characteristics Of DC Motors"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 8.3 Page Dc-111"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "speed of motion at half the torque= 1444.17 rpm\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "\n",
+    "#variable declaration\n",
+    "U=230     #voltage(V)\n",
+    "Ia1=155   #current(A)\n",
+    "Rm_Rse=0.1#armature resistance(ohm)\n",
+    "N1=1000  #speed(rpm)\n",
+    "\n",
+    "#calculation\n",
+    "Ia2=round(Ia1/math.sqrt(2),1) #current(A)\n",
+    "Eb1=U-(Ia1*Rm_Rse)   #voltage(V)\n",
+    "Eb2=U-(Ia2*Rm_Rse)   #voltage(V)\n",
+    "N2=(Eb2/Eb1)*(Ia1/Ia2)*N1\n",
+    "print 'speed of motion at half the torque=',round(N2,2),'rpm'"
+   ]
+  }
+ ],
+ "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
+}