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   "source": [
    "# Basic Electric Circuits and Components"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.1, Page 23"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Current, I = 15.9 mA\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "v1=15.8                 #voltage across r1\n",
    "v2=12.3                 #voltage across r2\n",
    "r2=220                  #resistance R2 in ohm\n",
    "\n",
    "#Calculation\n",
    "v=v1-v2                 #voltage difference across the resistor\n",
    "i=v/r2                  #current in ampere\n",
    "\n",
    "#Result\n",
    "print'Current, I = %.1f mA'%(i*1000)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.2, Page 24"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "I2 = 7 A\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "i1=10;                  #current in amp\n",
    "i3=3;                  #current in amp\n",
    "\n",
    "\n",
    "#Calculation\n",
    "i2=i1-i3                  #current in amp\n",
    "\n",
    "#Result\n",
    "print'I2 = %d A'%i2"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.3, Page 25"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "V1 = 5 V\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "E=12                  #EMF in volt\n",
    "v2=7                  #volt\n",
    "\n",
    "\n",
    "#Calculation\n",
    "v1=E-v2                  #volt\n",
    "\n",
    "#Result\n",
    "print'V1 = %d V'%v1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.4, Page 25"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "P = 450 W\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "i=3                        #current in amp\n",
    "r=50                       #resistance in ohm\n",
    "\n",
    "\n",
    "#Calculation\n",
    "p=(i**2)*r                       #power in watt\n",
    "\n",
    "#Result\n",
    "print'P = %d W'%p\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.5, Page 26"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "R = 70 ohm\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "r1=10                       #resistance in ohm\n",
    "r2=20                       #resistance in ohm\n",
    "r3=15                       #resistance in ohm\n",
    "r4=25                       #resistance in ohm\n",
    "\n",
    "\n",
    "#Calculation\n",
    "r=r1+r2+r3+r4                       #series resistance in ohm\n",
    "\n",
    "#Result\n",
    "print'R = %d ohm'%r\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.6, Page 27"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "R = 6.67 ohm\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "r1=10                       #resistance in ohm\n",
    "r2=20                       #resistance in ohm\n",
    "\n",
    "\n",
    "\n",
    "#Calculation\n",
    "r=(r1*r2)*(r1+r2)**-1                       #parallel resistance in ohm\n",
    "\n",
    "#Result\n",
    "print'R = %.2f ohm'%r\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.7, Page 28"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {
    "collapsed": false,
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "V = 6 V\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "r1=200                       #resistance in ohm\n",
    "r2=300                       #resistance in ohm\n",
    "\n",
    "\n",
    "#Calculation\n",
    "v=(10*r2)/(r1+r2)                       #resistance in ohm\n",
    "\n",
    "#Result\n",
    "print'V = %d V'%v"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.8, Page 29"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "V = 7 V\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "r1=1*10**3                       #resistance in ohm\n",
    "r2=500                       #resistance in ohm\n",
    "v1=15                         #voltage\n",
    "v2=3                         #voltage\n",
    "\n",
    "#Calculation\n",
    "v=v2+((v1-v2)*((r2)*(r1+r2)**-1))                       #resistance in ohm\n",
    "\n",
    "#Result\n",
    "print'V = %d V'%v\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 2.9, Page 30"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "T = 20 ms\n"
     ]
    }
   ],
   "source": [
    "#Initialisation\n",
    "f=50                       #frequency in herts\n",
    "\n",
    "\n",
    "#Calculation\n",
    "t=(1*f**-1)                    #time period\n",
    "\n",
    "\n",
    "#Result\n",
    "print'T = %d ms'%(t*10**3)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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