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diff --git a/electronic_instrumentation_by_H_S_Kalsi/Chap20.ipynb b/electronic_instrumentation_by_H_S_Kalsi/Chap20.ipynb
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@@ -0,0 +1,129 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:188a137b5dad28c9242953d4ba18308d43530d869157a87980207688e00b52f5"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 20 Measurment of power"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.1 Page no 721"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "V1=20                            #volts\n",
+      "V2=30                            #Volts\n",
+      "R1=100                           #ohm\n",
+      "\n",
+      "#Calculation\n",
+      "p=(V2**2-V1**2)/(4.0*R1)\n",
+      "\n",
+      "#Result\n",
+      "print\"RF test power is \", p,\"Watt\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "RF test power is  1.25 Watt\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.2 Page no 725"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "m=200                           #gm\n",
+      "sp=1                             #cal/gm degree C\n",
+      "T1=30                            #degree C\n",
+      "T2=40                            #degree C\n",
+      "\n",
+      "#Calculation\n",
+      "P=4.18*m*sp*(T2-T1)\n",
+      "\n",
+      "#Result\n",
+      "print\"The power is \",round(P*10**-3,1),\"K watt\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The power is  8.4 K watt\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 20.3 Page no 728"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "V1=8.0                               #Volts\n",
+      "V2=2.0                                #Volts\n",
+      "\n",
+      "#Calculation\n",
+      "SWR=(V1+V2)/(V1-V2)\n",
+      "print\"The standing wave ratio is \", round(SWR,2)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The standing wave ratio is  1.67\n"
+       ]
+      }
+     ],
+     "prompt_number": 14
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file