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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h1>Chapter 12: Transistors</h1>"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h3>Example 4, page no. 157</h3>"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Estimate the voltage gain Av, the current gain Ai and \n",
+      "#the power gain Ap when an input current of 20 \u03bcA peak varies sinusoidally about a mean bias of 50 \u03bcA.\n",
+      "from __future__ import division\n",
+      "import math\n",
+      "#initializing  the  variables:\n",
+      "Ia  =  0.040;#  in  Amperes\n",
+      "I  =  50;#  in  Amperes\n",
+      "Rl  =  1.2;#  in  Kohms\n",
+      "Vc  =  7; # in Volts\n",
+      "R = 1; # in Kohms\n",
+      "Ib = 50*1E-6; # in Amps\n",
+      "Iic = 20*1E-6; #in Amps\n",
+      "\n",
+      "#calculation:\n",
+      "Vi = (70 - 30)*1E-6 * 1000\n",
+      "Vo = 3.6\n",
+      "Av = Vo/Vi\n",
+      "\n",
+      "Io = 3*1E-3\n",
+      "Ii = (70 - 30)*1E-6\n",
+      "Ai = Io/Ii\n",
+      "\n",
+      "Ap = Av*Ai\n",
+      "\n",
+      "#Results\n",
+      "print  \"\\n\\n  Result  \\n\\n\"\n",
+      "print  \"\\n  voltage gain, Av  =  \",  round(Av,2)\n",
+      "print  \"\\n  Current gain, Av  =  \",  round(Ai,2)\n",
+      "print  \"\\n  Power gain, Av  =  \",  round(Ap,2)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "\n",
+        "  Result  \n",
+        "\n",
+        "\n",
+        "\n",
+        "  voltage gain, Av  =   90.0\n",
+        "\n",
+        "  Current gain, Av  =   75.0\n",
+        "\n",
+        "  Power gain, Av  =   6750.0"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file