Ohm's law — An Etymological Dictionary of Astronomy and Astrophysics

Ohm's law

قانونِ اُهم

qânun-e Ohm (#)

Fr.: loi d'Ohm

For a → conductor at rest, the → voltage across the conductor is equal to the product of the current flowing through it and its → resistance. In other words, when such a conductor is subjected to an electric field E, the resulting → current density, J, is proportional to the electric field E: J = σE, where σ is the → conductivity, i.e. the reciprocal of → resistivity, ρ = 1/σ.
Ohm’s law for a moving conductor is expressed by:

J = σ(E + v x B), where v is the velocity and B
the → magnetic induction.

See also: → ohm; → law.

An Etymological Dictionary of Astronomy and Astrophysics