PHYSICAL QUANTITY

Resistivity: formulas and units of measurement

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

ρohm meter

KEY CONNECTIONS

Formulas

R = ρl / S

ρ = ρ₀(1 + αt)

1 Ohm m = 10⁶ Ohm mm²/m

NOTATION

: Electrical resistance is a measure of a conductor's resistance to electric current.
: Resistivity is a characteristic of a material’s ability to resist current.
: Conductor length is the length of the conductor section under consideration.
: Area is the size of a surface or cross section.
: Initial resistivity is the resistivity at the initial temperature.
: Temperature coefficient is a characteristic of the change in resistance when heated.
: Temperature is a measure of the thermal state of the body.

THEORY

PRACTICE

Topics in order: the concepts, quantities and formulas of a lesson with explanations and examples.

Statements, answer options and a detailed walkthrough for every topic of the course.

A 10-question check-up, exercises with answer checking, and saved progress.