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--- a/Electrical_Circuit_Theory_And_Technology/chapter_12-checkpoint.ipynb
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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