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   "source": [
    "# Chapter 18: Transient Behaviour"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 18.1, Page 376"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "v = 18.36 V\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "c=100*10**-6               #capacitance in farad\n",
    "r=100*10**3                #resistance in ohm\n",
    "v=20                       #volt\n",
    "t=25                       #time in seconds\n",
    "e=2.71828                  #mathematical constant\n",
    "\n",
    "#Calculation\n",
    "T=c*r                     #time in seconds\n",
    "v1=v*(1-e**(-t*T**-1))    #volt\n",
    "\n",
    "#Result\n",
    "print'v = %.2f V'%v1\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 18.2, Page 378"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "t = 10.2 mSec\n"
     ]
    }
   ],
   "source": [
    "import math\n",
    "\n",
    "#Initialisation\n",
    "l=400*10**-3               #inductance in henry\n",
    "i1=300                     #current in milliamp\n",
    "r=20                       #resistance in ohm\n",
    "v=15                       #volt\n",
    "t=25                       #time in seconds\n",
    "e=2.71828                  #mathematical constant\n",
    "\n",
    "#Calculation\n",
    "T=l/r                     #time in seconds\n",
    "i=(v*r**-1)*10**3         #current in amp\n",
    "t=((math.log(i/(i-i1)))/(math.log(e)))*0.02  #expression to find time t\n",
    "\n",
    "#Result\n",
    "print't = %.1f mSec'%(t*10**3)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 18.3, Page 382"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "v = 10 - 5 e^( -t/0.2 )  V\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "c=20*10**-6               #capacitance in farad\n",
    "r=10*10**3                #resistance in ohm\n",
    "v=5                       #volt\n",
    "v2=10                       #volt\n",
    "\n",
    "#Calculation\n",
    "T=c*r                     #time in seconds\n",
    "\n",
    "#Result\n",
    "print'v = %d - %d e^( -t/%.1f )  V'%(v2,v,T)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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