What are the factors affecting the resistance of a material?
There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material. When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms.
Does resistivity depend on shape?
The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.
What happens to the resistance of a wire if its area is doubled why?
So, the new resistance, after doubling the length of the wire, becomes twice of the original resistance. Hence, if the length of a wire is doubled, then its resistance becomes doubled. Note: Otherwise the change in the value of resistance will occur due to the change in the cross sectional area also.
What is the resistance when both length and radius of the wire are doubled?
Hence, If the length of a wire is doubled, then its resistance becomes 2 times.
What is the resistance of a 100m length?
The resistance will be 0.001 * 8 * 1/0.125 = 0.001 * 64 = 0.064 ohms. When a wire that has 100 mm length, resistivity of 50*10^-8 and cross sectional area of 0.1 mm is drawn out 3 times its original length, by how many times will its original lengths be increased?
How does the resistance of a wire vary with its cross sectional area?
It is inversely proportional to the area of cross section of the wire. The more the area of cross section of the wire,the less is the resistance and the less the area,the more is the resistance.
What is the ratio of resistivity?
Residual-resistivity ratio (also known as Residual-resistance ratio or just RRR) is usually defined as the ratio of the resistivity of a material at room temperature and at 0 K. Of course, 0 K can never be reached in practice so some estimation is usually made.