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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 16: Power in AC Circuits"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 16.1, Page 329"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"(a) Apparent power, S = 250 VA\n",
"(b) Power Factor = 0.866\n",
"(c) Active Power, P = 216.5\n"
]
}
],
"source": [
"import math\n",
"\n",
"#Initialisation\n",
"V=50 #Voltage\n",
"I=5 #Current in Ampere r.m.s\n",
"phase=30 #in degrees\n",
"\n",
"#Calculation \n",
"S=V*I #apparent power\n",
"pf=math.cos(phase*math.pi/180) #power factor\n",
"apf=S*pf #active power\n",
"\n",
"#Result\n",
"print'(a) Apparent power, S = %d VA'%S\n",
"print'(b) Power Factor = %.3f'%pf\n",
"print'(c) Active Power, P = %.1f'%apf"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 16.2, Page 331"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
" Apparent Power, P = 2000 W\n",
" Active Power, P = 1500 W\n",
" Reactive Power, Q = 1322 var\n",
" Current I = 8.33 A\n"
]
}
],
"source": [
"import math\n",
"\n",
"#Initialisation\n",
"pf=0.75 #power factor\n",
"S=2000 #apparent power in VA\n",
"V=240 #Voltage in volts\n",
"\n",
"#Calculation \n",
"apf=S*pf #active power\n",
"sin=math.sqrt(1-(pf**2)) \n",
"Q=S*sin #Reactive Power\n",
"I=S*V**-1 #Current\n",
"#Result\n",
"print' Apparent Power, P = %d W'%S\n",
"print' Active Power, P = %d W'%apf\n",
"print' Reactive Power, Q = %d var'%Q\n",
"print' Current I = %.2f A'%I"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 16.3, Page 333"
]
},
{
"cell_type": "code",
"execution_count": 19,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
" Apparent Power, S = 1500 W\n",
" Active Power, P = 1500 W\n",
" Reactive Power, Q = 1322 var\n",
" Current I = 6.25 A\n"
]
}
],
"source": [
"import math\n",
"\n",
"#Initialisation\n",
"pf=0.75 #power factor\n",
"S=1500 #apparent power in W\n",
"V=240 #Voltage in volts\n",
"P1 = 2000 #apparent power\n",
"P2 = 1500 #active power\n",
"Q = 1322 #reactive power\n",
"I = 8.33 #current in amp\n",
"f=50 #frequency in hertz\n",
"\n",
"#Calculation \n",
"Xc=V**2/Q #reactive capacitance\n",
"C=1/(Xc*2*math.pi*f) #capacitance\n",
"I=S*V**-1 #current\n",
"\n",
"#Result\n",
"print' Apparent Power, S = %d W'%S\n",
"print' Active Power, P = %d W'%apf\n",
"print' Reactive Power, Q = %d var'%Q\n",
"print' Current I = %.2f A'%I"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 16.4, Page 335"
]
},
{
"cell_type": "code",
"execution_count": 24,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Zl = (50+20j)\n"
]
}
],
"source": [
"import math\n",
"import numpy as np\n",
"\n",
"#Initialisation\n",
"Zo=complex(50,-20) #complex form of output impedance\n",
"\n",
"#Calculation \n",
"Zl=np.conjugate(Zo) #complex form of Load impedance\n",
"\n",
"#Result\n",
"print'Zl = %s'%Zl"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python [Root]",
"language": "python",
"name": "Python [Root]"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.12"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
