Does same material have same resistivity?

Two wires are of the same material but of different lengths and areas of cross-section. Will their resistivities be same or different? Resistivity depends on the material of the conductor and not on its dimensions. Hence, the two wires will have the same resistivity.

What is the resistivity of a copper wire?

The resistivity of an exceedingly good electrical conductor, such as hard-drawn copper, at 20° C (68° F) is 1.77 × 10-8 ohm-metre, or 1.77 × 10-6 ohm-centimetre.

Will copper wires of different length have different resistivity?

The correct answer is All the wires would have same resistivity. The resistivity of copper is generally given as 1.72 x 10-8 Ωm.

Does copper wire have less resistance?

Copper has a lower resistivity and is a better conductor of electricity than iron. Why? The resistance of a wire increases with length. Because resistance is the property of a material that resists electron flow, it makes sense that the more material you have (longer length) the more resistance you will have.

Do longer wires have more resistance?

First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. When all other variables are the same, charge will flow at higher rates through wider wires with greater cross-sectional areas than through thinner wires.

How do you find the resistivity of copper?

Engineers often ask how to calculate the resistance of a cable, there is a very simple formula that works well within an ohm or so with copper cable. 19 ÷ by 2.5mm² will give you 7.6 ohms per km. ÷ by 1000 for resistance per meter. 19 ÷ by 4mm² will give you 4.75 ohms per km.

Which wire will have more resistivity?

Resistance of a wire is directly proportional to the length (l) of the wire and inversely proportional to the area of cross-section of the wire. So, the thicker wire will have more specific resistance as resistivity is directly proportional to area of cross-section.

What happens to resistance and resistivity if a wire of length L and radius R is stretched to double of its length?

When the wire is stretched to double the length , the area of cross section gets reduced to half. So when the wire is stretched, the resistance multiplies by four times.

Why does copper have a low resistivity?

Pure copper has less resistance than copper containing impurities. Impurity atoms are a different size to copper atoms, so they get in the way of moving electrons. Once the ions are vibrating, they hinder the flow of the electrons. This is because the electrons will be scattered off the vibrating ions.

Why do copper wires have less resistance than thin wires of the same size?

The relationship between resistance and wire length is proportional . The resistance of a thin wire is greater than the resistance of a thick wire because a thin wire has fewer electrons to carry the current. The relationship between resistance and the area of the cross section of a wire is inversely proportional .