# What is the area in circular mils of a wire with a diameter of 0.005 in.?
# Given data
Din = 0.005# # Diameter in Inches=0.005 in.
Dmil = 5# # Diameter in Mils=5 mil.
# 0.005 in. = 5 mil
# Therefore: Din == Dmil
A = Dmil*Dmil#
print 'The Circular Area = %0.2f cmils'%A
# A stranded wire is made up of 16 individual strands of No. 27 gage wire. What is its equivalent gage size in solid wire?
# Given data
N = 16# # No. of strands=16
A27 = 201.5 # Circular area of No. 27 Guage wire=201.5 cmils
A = N*A27#
print 'The Total Area = %0.2f cmils'%A
# How much is the resistance of 100 ft of No. 20 gage copper wire?
# Given data
roh = 10.4# # roh or specific resistance=10.4 (for Copper)
l = 100.# # Lenght=100 feet
A = 1022# # Area of No. 20 Gage=1022 cmil
R = roh*(l/A)#
print 'The Resistance of 100 ft of No. 20 gage Copper Wire = %0.2f ohms'%R
# How much is the resistance of 100 ft of No. 23 gage copper wire?
# Given data
roh = 10.4# # roh or specific resistance=10.4 (for Copper)
l = 100# # Lenght=100 feet
A = 509.5# # Area of No. 23 Gage=509.5 cmil
R = roh*(l/A)#
print 'The Resistance of 100 ft of No. 20 gage Copper Wire = %0.2f ohms'%R
# How much is the resistance of a slab of germanium 0.2 cm long with a crosssectional area of 1 sqcm?
# Given data
roh = 55.0# # roh or specific resistance=55 (for Germanium)
l = 0.2*10**-2# # Lenght=100 feet
A = 1.0*10**-2# # Area=1 sqcm
R = roh*(l/A)#
print 'The Resistance of a Slab of Germanium = %0.2f ohms'%R
# A tungsten wire has a 14-Ohms R at 20°C. Calculate its resistance at 120°C.
# Given data
Tmax = 120.# # Temp(max)=120 degree Centigrates
Tmin = 20.# # Temp(min)=20 degree Centigrates
Ro = 14.# # Wire Resistance=14 Ohms
alpha = 0.005# # Aplha=0.005 (for Tungsten)
delta = Tmax-Tmin#
Rt = Ro+Ro*(alpha*delta)#
print 'The Resistance at 120°C = %0.2f ohms'%Rt