What is the formula to calculate resistivity?
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. The unit of resistance is the ohm.
What is resistivity solution?
The constant p(rho) is called resistivity or specific resistance. Unit = If l is expressed in cm, A in cm² and R in ohm, the unit of resistivity will be : cm² * ohm / cm = ohm cm. If L = 1 cm and A = 1 cm² , then. p = R. Thus, Resistivity of any solution is the resistance of one cm cube.
What will be the resistivity of a metal wire of 2m length and 0.6 mm in diameter if the resistance of the wire is 50ω?
Expert-verified answer Resistivity of the wire is 7.065 × 10^-8 Ω m.
What is difference between resistance and resistivity?
Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions.
What is the coefficient of resistivity?
ρ = ρ0 (1 +αΔT), where ρ0 is the original resistivity and α is the temperature coefficient of resistivity….Table 2. Tempature Coefficients of Resistivity α
| Material | Coefficient (1/°C) |
|---|---|
| Nichrome (Ni, Fe, Cr alloy) | 0.4 × 10−3 |
| Semiconductors | |
| Carbon (pure) | −0.5 × 10−3 |
| Germanium (pure) | −50 × 10−3 |
What is the resistivity of gold?
Gold’s electrical resistivity is 0.022 micro-ohm m at 20 °C, and its thermal conductivity is 310 W m-1 K-1 at the same temperature. The corrosion resistance of gold is possibly one of its most valuable properties.
What will be the resistivity of a metal wire of 2m length?
Resistance of metal wire of length 2m is 40ohm.
What is the resistivity of a metal wire?
ρ = (AR) / l. where: ρ is the resistivity of the metal wire. A is the cross sectional area of the specimen wire. R is the electrical resistance of a uniform metal wire.
What is resistivity 12th?
The resistance per unit length and cross-sectional area is called resistivity. It is constant for each material. The resistivity changes from material to material.
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.