where is more of electrecity lose: in wire 1mm dia. or 2.5mm dia. if they are same long?

Question

if we want to connect electrecity to a house , is it better to use a wire with 1mm. dia. or 2.5mm. dia. for a distance of 30m.?And why?

Answer 1

For a given length of a wire the resistance is inversely proportional to the square of the diameter.

Smaller the diameter, higher is the resistance.

Heat given out is the product of the square of the current and resistance.

For the same current heat loss will be more for high resistances.

Therefore, heat given out will be more in wire having small diameter.

Answer 2

No. In the U.S.A. (under the National Electric Code) the *minimum* size for wire to a house would be (Article 230.23(B) "#8" (Copper), or 3.3mm.

1.0 would lose more electricity, but both the 1.0 and 2.5 would be illegal for a "service" (to a house) in much of the United States.

2.5 would be better than 1.0

Protect with a fuse or circuit breaker.

Answer 3

i think it would be in a 1mm wire that more electricity would be lost as the 2.5mm wire would have greater area of cross section and hence the electrons could move more freely,hence decreasing the resistance.

Answer 4

Less diameter more resistance.

R= p (L/A)
R- resistance
p - resistivity material constant
L - length of material
A - Cross sectional area of the material

In fact in your case,(sice lengths are the same and same material is used) the resistance of 1 mm will be less than 2.5 mm by a factor of 6.25 .

Answer 5

the resistance of a wire is inversely propotional to its cross-sectional area. so, wire with 2.5 mm will have lower resistance.

Answer 6

The more you want to run the bigger the wire needs to be!
Distance has less to do with it then your Amp draw.

Answer 7

2.5,less risistance,bigger is better

Answer 8

2.5, less resistance, less heat loss (I^2R loss)