Table of Contents
- 1 What is specific resistance and resistivity?
- 2 What is specific resistance of a wire?
- 3 What is the resistivity of copper wire?
- 4 What is resistivity physics?
- 5 Why is resistivity also known as specific resistance?
- 6 What is resistivity with example?
- 7 What determines the resistance of a wire?
- 8 What does the resistivity of a wire depend on?
What is specific resistance and resistivity?
Resistivity or specific resistance of a material is a measure of the resistance, which it offers to the flow of current through it. It is an intrinsic property of a material. Specific resistance depends on the composition, temperature, pressure of the material. The resistivity of a material is a scalar quantity.
What is specific resistance of a wire?
The specific resistance or resistivity of a wire is the property of the material of it. It does not depend on mass, length or cross-section of wire. It may change with temperature.
What is specific resistance class 12?
As explained in the hint, the specific resistance or resistivity of a material is defined as the resistance of a body of unit length and cross sectional area made of that material. It is a constant characteristic property of the material. Hence, mathematically, it is expressed as, ρ=RAl —(1)
Is resistivity and specific resistance are same?
The resistivity is also known as specific resistance. The resistivity represents the resistance of the material which has specific dimensions, i.e., the material has 1-meter length and 1 square meter area of cross section.
What is the resistivity of copper wire?
Resistivity and Temperature Coefficient at 20 C
| Material | Resistivity ρ (ohm m) | |
|---|---|---|
| Copper | 1.68 | x10-8 |
| Copper, annealed | 1.72 | x10-8 |
| Aluminum | 2.65 | x10-8 |
| Tungsten | 5.6 | x10-8 |
What is resistivity physics?
resistivity, electrical resistance of a conductor of unit cross-sectional area and unit length. Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l.
What is resistivity Class 9?
Resistivity is defined as the resistance offered by the material per unit length for unit cross-section. The SI unit of resistivity is Ohm. meter. Resistivity increases linearly with temperature. The resistivity of conductors is low when compared to the resistivity of the insulators.
How do you find the resistivity of A wire?
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l.
Why is resistivity also known as specific resistance?
The resistivity is also known as specific resistance. The resistivity represents the resistance of the material which has specific dimensions, i.e., the material has 1-meter length and 1 square meter area of cross section. The resistivity is directly proportional to the temperature of the material.
What is resistivity with example?
We have also learnt that the resistivity (symbol: ρ) of the conductor (or material) relates to the physical property from which it is made and varies from material to material. For example, the resistivity of copper is generally given as: 1.72 x 10-8 Ωm.
What is resistivity Class 11?
Resistivity is also known as specific resistance. It is the resistance of the specific material; also it is specific to a material. R=ρ, If A and L =1 in Equation R= ρ (L/A). Resistivity is defined as resistance of unit length and unit area of a conductor. To overcome more resistivity more electric filed is applied.
What kind of wire has the most resistance?
The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. 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.
What determines the resistance of a wire?
There are four factors that affect the resistance of a wire: Resistance is proportional to length. If you take a wire of different lengths and give each a particular potential difference across its ends. The longer the wire the less volts each centimetre of it will get.
What does the resistivity of a wire depend on?
Resistivity is characteristic of a material. Therefore resistivity of wire will only depend on “material of wire”. If wire is of copper then it’s resistivity will be x and if it is of magnin then it will be y.
What is the equation for the resistance of a wire?
Conductance formula and resistance formula R is the resistance in Ω, ρ is the resistivity of material in Ω * m, L is the length of wire, A is the cross-sectional area of the wire.