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Electrical resistivity is a measure of how a material opposes the flow of electric current. Copper is used for electrical lines because it has a low resistance relative to its cost. Gold and silver also have a low resistance, but imagine how expensive the power cord for your computer would be if it were made of gold!
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoThe specific resisitivity of a material is determined by measuring the resistance of a test conductor having unit length and unit cross sectional area.
AnswerIn fact, there is no such expression as 'specific resistivity'; you are probably thinking of the term 'specific resistance', which is an obsolete term for 'resistivity', which is a physical property of a material.
As the original answer explains, resistivity is defined as 'the resistance of a unit length of a material of uniform cross section'.
In SI, this definition equates to 'the resistance of between opposite sides of a one-metre cube of a material'. Note that a 'metre cube' is not the same thing as 'cubic metre'! It literally means a cube, with one-metre sides!
The SI unit for resisitivity is the ohm metre; in North America, the unit is the ohm circular mill per foot.
Resistivity provides us with a means of comparing the resistances of different materials while eliminating the physical dimensions involved.
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Why does the electrical resistivity of a conductor does not depend on its dimensions?
resistivity and resistance are two diff. things...........resistance depends on length and thickness resisitivity too depends on the area and length resistivity=resistance*area/length
How do you work out resistance with voltage and joules?
Resistance of a conductor is defined by the specific resistivity, area of cross section and the length of the conductor. R = rL/A, where R is resistance in OHMs, r is specific resistance, L length in mm, A is area of cross section in sq mm
What device is used to measure the resistance of a resistor?
You can use a multi-meter to measure resistance. The specific portion of the meter for measuring resistance is called an ohmmeter.
What happens to current flow when the resistance is higher than normal?
For a specific voltage, current flow is inversely proportional to resistance.
What are mathematical relationship between resistance and specificconductivity constant?
Cell constant(C) = Resistance(R) X Specific Conductivity(K)
Why does nichrome get hot?
Nichrome has a high electrical resistivity.
How is friction and air resistance different?
yes it is a big diff in both of them air resistanceis in water butfrictionis every where
Why does the electrical resistivity of a conductor does not depend on its dimensions?
resistivity and resistance are two diff. things...........resistance depends on length and thickness resisitivity too depends on the area and length resistivity=resistance*area/length
What is the law of resistance?
The laws of resistance describes the resistance of a specific material. There are a total of four laws of resistance.
How long was the jewish resistance?
It was not a specific event. Resistance appeared where there was oppression.
Is resistance to antibiotics permanent?
No, resistance to antibiotics is not permanent. However, once you have a resistance, that antibiotic will no longer work for specific infections.
What is the formula for conductivity?
1/specific resistance
What are the rules for electricity resistance?
Resistance of a conductor is defined by the specific resistivity, area of cross section and the length of the conductor. R = rL/A, where R is resistance in OHMs, r is specific resistance, L length in mm, A is area of cross section in sq mm
How do you work out resistance with voltage and joules?
Resistance of a conductor is defined by the specific resistivity, area of cross section and the length of the conductor. R = rL/A, where R is resistance in OHMs, r is specific resistance, L length in mm, A is area of cross section in sq mm
Three ways which resistance of a wire can be increased?
You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).You can increase the resistance in the wire, by doing any of the following:Increase the length of the wire.Reduce the wire's cross-section.Change to a material that has a greater resistivity (specific resistance).
Why a megger fail to distinguish diff readings of d insulation resistance in d upper range of its scale?
More information is needed as to what your terminology of D insulation is.
What are the Diff songs in diff region?
It means Different songs in different regions . In diff places have diff folks .
