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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 11 : Conductors and Insulators"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example No. 11_1 Page No. 329"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The Circular Area = 25.00 cmils\n"
]
}
],
"source": [
"# What is the area in circular mils of a wire with a diameter of 0.005 in.?\n",
"\n",
"# Given data\n",
"\n",
"Din = 0.005# # Diameter in Inches=0.005 in.\n",
"Dmil = 5# # Diameter in Mils=5 mil.\n",
"\n",
"# 0.005 in. = 5 mil\n",
"# Therefore: Din == Dmil\n",
"\n",
"A = Dmil*Dmil#\n",
"print 'The Circular Area = %0.2f cmils'%A"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example No. 11_2 Page No. 335"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The Total Area = 3224.00 cmils\n"
]
}
],
"source": [
"# A stranded wire is made up of 16 individual strands of No. 27 gage wire. What is its equivalent gage size in solid wire?\n",
"\n",
"# Given data\n",
"\n",
"N = 16# # No. of strands=16\n",
"A27 = 201.5 # Circular area of No. 27 Guage wire=201.5 cmils\n",
"\n",
"A = N*A27#\n",
"print 'The Total Area = %0.2f cmils'%A"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example No. 11_3 Page No. 340"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The Resistance of 100 ft of No. 20 gage Copper Wire = 1.02 ohms\n"
]
}
],
"source": [
"# How much is the resistance of 100 ft of No. 20 gage copper wire?\n",
"\n",
"# Given data\n",
"\n",
"roh = 10.4# # roh or specific resistance=10.4 (for Copper)\n",
"l = 100.# # Lenght=100 feet\n",
"A = 1022# # Area of No. 20 Gage=1022 cmil\n",
"\n",
"R = roh*(l/A)#\n",
"print 'The Resistance of 100 ft of No. 20 gage Copper Wire = %0.2f ohms'%R"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example No. 11_4 Page No. 342"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The Resistance of 100 ft of No. 20 gage Copper Wire = 2.04 ohms\n"
]
}
],
"source": [
"# How much is the resistance of 100 ft of No. 23 gage copper wire?\n",
"\n",
"# Given data\n",
"\n",
"roh = 10.4# # roh or specific resistance=10.4 (for Copper)\n",
"l = 100# # Lenght=100 feet\n",
"A = 509.5# # Area of No. 23 Gage=509.5 cmil\n",
"\n",
"R = roh*(l/A)#\n",
"print 'The Resistance of 100 ft of No. 20 gage Copper Wire = %0.2f ohms'%R"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example No. 11_5 Page No. 344"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The Resistance of a Slab of Germanium = 11.00 ohms\n"
]
}
],
"source": [
"# How much is the resistance of a slab of germanium 0.2 cm long with a crosssectional area of 1 sqcm?\n",
"\n",
"# Given data\n",
"\n",
"roh = 55.0# # roh or specific resistance=55 (for Germanium)\n",
"l = 0.2*10**-2# # Lenght=100 feet\n",
"A = 1.0*10**-2# # Area=1 sqcm\n",
"\n",
"R = roh*(l/A)#\n",
"print 'The Resistance of a Slab of Germanium = %0.2f ohms'%R"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example No. 11_6 Page No. 344"
]
},
{
"cell_type": "code",
"execution_count": 11,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The Resistance at 120°C = 21.00 ohms\n"
]
}
],
"source": [
"# A tungsten wire has a 14-Ohms\u0002 R at 20°C. Calculate its resistance at 120°C.\n",
"\n",
"# Given data\n",
"\n",
"Tmax = 120.# # Temp(max)=120 degree Centigrates\n",
"Tmin = 20.# # Temp(min)=20 degree Centigrates\n",
"Ro = 14.# # Wire Resistance=14 Ohms\n",
"alpha = 0.005# # Aplha=0.005 (for Tungsten)\n",
"\n",
"delta = Tmax-Tmin#\n",
"\n",
"Rt = Ro+Ro*(alpha*delta)#\n",
"print 'The Resistance at 120°C = %0.2f ohms'%Rt"
]
}
],
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|
