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Question

Why is copper a better conductor of electricity than 
aluminium?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Because copper has more free electrons than aluminium but
not as much as gold or silver.
 
Is This Answer Correct ?    6 Yes 1 No
Therion
 
Answer
# 2
since copper has high current carrying capacity..
it has low resistance..
it is of smaller in size then aluminium...
 
Is This Answer Correct ?    9 Yes 5 No
Deepak Thakur
 
 
 
Answer
# 3
The electrical capacity of any type of cables/wires are
depending on the heat withstand capacity of the material
wich can be calculated with the product of square of
current, Resistance of the material and Total time for flow
of current. I2RT. Resistance again can be calculated as
R=rho*L/A where rho is the resistivity, L is the length and
A is the area of cross section. So for a fixed current flow
and fixed Length of wire the area of cross section of the
cable is directly propotional to the resistivity.
resistivity of copper is 1.68x10 power -8 and that of Pure
Aluminum is 2.82x10 power -8. So.. for a specific current
flow, an aluminum cable size shall be 1.7 times that of
copper cable. This also is not recommented as the Aluminum
resistivity varries with the alloys and even with casting.
2.5 times the size of copper can be recommented for
Aluminum cables. Also as the temporature expansion of
Aluminum is 3 times that of copper. So all the termination
and joining areas shall be treated more sensible that of
copper.
 
Is This Answer Correct ?    1 Yes 0 No
Arul
 
Answer
# 4
Copper has less specific resistance than that of Aluminum....... 
Is This Answer Correct ?    1 Yes 4 No
Tariq
 
Answer
# 5
Copper has a lower resistance than aluminium so for the
same cross sectional area a copper cable will have less
power loss.
 
Is This Answer Correct ?    2 Yes 6 No
Kevin Fowke
 

 
 
 
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