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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Chapter 6:POWER AND POWER FACTOR"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex6.1:pg-229"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"115.69 =Average Power is(in watts)\n"
]
}
],
"source": [
"#Example 6_1 page no:229\n",
"import math \n",
"phase_angle=30#phase angle in degree\n",
"Vm=100#maximum voltage\n",
"Veff=100.0/math.sqrt(2)\n",
"Ieff=15/math.sqrt(2)\n",
"Pav=Veff*Ieff*math.cos(phase_angle)\n",
"print round(Pav,2),\"=Average Power in watts\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex6.2:pg-230"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"62.5 =Average power in watts\n"
]
}
],
"source": [
"#Example 6_2 page no:230\n",
"import numpy\n",
"Z=5+8j\n",
"Im=5#maximum current\n",
"Pav=Im**2*numpy.real(Z)/2\n",
"print Pav,\"=Average power in watts\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex6.3:pg-231"
]
},
{
"cell_type": "code",
"execution_count": 15,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"625.0 =Apparent Power in VA\n",
"-0.918 =Power Factor \n",
"-573.927 =Average Power in watts\n"
]
}
],
"source": [
"#Example 6_3 page no:231\n",
" \n",
"theta=53\n",
"Vm=50#peak voltage\n",
"Im=25#peak current\n",
"Veff=Vm/math.sqrt(2)\n",
"Ieff=Im/math.sqrt(2)\n",
"Papp=Veff*Ieff\n",
"print Papp,\"=Apparent Power in VA\"\n",
"print round(math.cos(theta),3),\"=Power Factor \"\n",
"Pav=Veff*Ieff*math.cos(theta)\n",
"print round(Pav,3),\"=Average Power in watts\"\n",
"#value of power factor is rounded off in text book so value vary slightly\n"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.11"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
