Question

Please write the python functions

Problem: Electric wire (Figure is a cylindrical conductor covered by an insulating material. Figure 2 shows the structure ofa single conductor. The resistance of a piece ofwire is given by the formula: A d where ρ is the resistivity of the conductor, and I (in meter), A, and d (in meter) are the length, cross-sectional area, and diameter of the wire. The wire diameter, d, is commonly specified by the American Wire Gauge (AWG). Which is a positive integer eenic wire igure 1 Cyfril n.The diameter d (in mm) at an AWG n wire is given by the formula d 0.127 x 9279-mm Materials such as copper and aluminum are known for their low levels A Single Conductor of resistivity thus allowing electrical current to easily flow through them making these materials ideal for making electrical wires and cables. Silver and gold have very low resistivity values, but for obvious reasons are more expensive to turn into electrical wires. The resistivity p value vary depends on the wire material type as follows: igure 2 A singecour . The resistivity of copper is l.678X10a Ω m. - The resistivity of aluminum is 2.82 X 10 2m. The resistivity of gold is 2 .44 X 104 Ω m. Write a python program that reads from a file some clectrical wire information (see sample input file in figure 3). For each wire, the program computes the resistance R based on its material, wire gauge and length values. Your program should validate the file records as follows Accepts positive wire gauge as integers n generates a positive random integer S40. Such a record has to be counted as illegal record for statistical purposes Accepts standard wire length in meter, L E [50, 200]. Any invalid length has to be ignored and the wire record is considered as illegal record. Allows copper, aluminum and gold materials only. For any other types, the program ignores the record and count it as illegal record. 40. Otherwise, it neglects the incorrect value and - The following figure 4 shows a sample output for the given sample input in figure 3. Page 2 of 4

Answer 1

Code:

import random
import math

def printHeader():
    print("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")
    print("Wire     Wire     Wire      Wire          Resistance")
    print(" no.     gauge    length    material       (OHM)")
    print("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")
    
def diameter(wireGauge):
    d=0.127*math.pow(92,((36-wireGauge))/39)
    d=d/1000
    return d
def copperWireResistance(length,wireGauge):
    p=1.678E-8
    d=diameter(wireGauge)
    R=(4*p*length)/(math.pi*d*d)
    return "%10.3E"%(R)
    
def goldWireResistance(length,wireGauge):
    p=2.44E-8
    d=diameter(wireGauge)
    R=(4*p*length)/(math.pi*d*d)
    return "%10.3E"%(R)

def aluminumWireResistance(length,wireGauge):
    p=2.82E-8
    d=diameter(wireGauge)
    R=(4*p*length)/(math.pi*d*d)
    return "%10.3E"%(R)
#print(copperWireResistance(100,35))
#print(aluminiumWireResistance(160,23))

def main():
    printHeader()
    fh=open("SampleInput.txt",'r')
    contents=fh.readlines()
    illegal=0
    total=0
    count=0
    aluminum_total=0
    for line in contents:
        #print(len(list(line.split(' '))))
        gauge,length,material=line.rstrip().split(' ')
        length=float(length)
        total+=1
        try:
            if not(int(gauge)>0 and int(gauge)<=40):
                raise ValueError
        except ValueError:
            gauge=random.randint(1,40)
            illegal+=1
           
        if not(length>=50 and length<=200):
            illegal+=1
            continue
            
        if material=='gold':
            count+=1
            R=goldWireResistance(length,int(gauge))
            print(count,"\t",gauge,"\t ",length,"    Gold \t ",R)
        elif material=='copper':
            count+=1
            R=copperWireResistance(length,int(gauge))
            print(count,"\t",gauge,"\t ",length,"    Copper\t ",R)
        elif material=='aluminum':
            count+=1
            aluminum_total+=1
            R=aluminumWireResistance(length,int(gauge))
            print(count,"\t",gauge,"\t ",length,"    Aluminum\t ",R)
        else:
            illegal+=1
    print("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")
    print("Total records:",total)  
    incorrect=illegal*100/total
    print("Incorrect records:",illegal,"corresponds to "+str(round(incorrect,2))+"% of the records")
    alu_per=aluminum_total*100/total
    print("Percentage of aluminum wires "+str(round(alu_per,2))+"%")
    print("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")
            
main()       
        

Note: Sample input file should have values separated by a single space.

Sample Input:

SampleInput.txt

35 100 copper
-28 160 aluminum
15 110 copper
6 170 aluminum
40 95 aluminum
- 200 aluminum
9 16 aluminum
27 45 gold
30 100 silver
39 65 gold
1 150 copper
20 400 aluminum
40 180 gold
5 135 gold
50 180 copper
17 200 aluminum
7 85 copper
7 190 copper
19 50 copper
30 70 aluminum
5a 120 gold
21 190 copper

Output: