How the formula to get Voltage Drop for Cable With Copper Conductor And Aluminium Conductor?

Question

How the formula to get Voltage Drop for Cable With Copper Conductor And Aluminium Conductor?

Answer 1

Ohms law.  V=I*R.

You need to know the current flowing in the wire (usually a given) and to calculate the resistance.

The resistance is directly proportional to the length.  The longer it is the more resistance you have.  2 meters or cable has twice as much resistance than 1 meter of cable.

The resistance is also indirectly proportional to the cross sectional area of the cable.  Usually you assume the cable conductor is a cylinder with a circle cross section.  The area is the area of the circle (pi*radius^2).  The wider a cable is, the less resistance you have.

The resistance is also directly proportional to the resistivity of the material.  Resistivity is the inverse of conductivity.  You get those from a table.  Some materials conduct better than others.

The equation is R=(p*l)/A where p is the resistivity of the material, l is the cable length, and A is the cross sectional area.

Here's a site with a table of electrical resistivity.

http://en.wikipedia.org/wiki/Electrical_...

Make sure all the units are in meters and meters^2 (for area) when you do the calculation.

Answer 2

%e = 100 x Lx N /

Kx S x U²



K= 56 For Cu

K= 35 For Al

U= Voltage volt

N= power kW

S= crosssection of the cable  mm²

L= length of the cable or wire mt