PHYSICAL QUANTITY

Resistivity: formulas and units of measurement

Resistivity: symbol ρ, unit Ohm m. Formulas and explanations for Electricity.

\rhoρ\text{Ом}\cdot\text{м}ohm metre

KEY CONNECTIONS

Formulas

R=\rho\frac{l}{S}R = ρl / S

\rho=\rho_0(1+\alpha t)ρ = ρ₀(1 + αt)

1\ \text{Ом}\cdot\text{м}=10^6\ \frac{\text{Ом}\cdot\text{мм}^2}{\text{м}}1 Ом·м = 10⁶ Ом·мм²/м

NOTATION

R: Electrical resistance is a measure of a conductor's resistance to electric current.
\rho: Resistivity is a characteristic of a material’s ability to resist current.
l: Conductor length is the length of the conductor section under consideration.
S: Area is the size of a surface or cross section.
\rho_0: Initial resistivity is the resistivity at the initial temperature.
\alpha: Temperature coefficient is a characteristic of the change in resistance when heated.
t: Temperature is a measure of the thermal state of the body.

THEORY

PRACTICE