An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) 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.
2) 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.

→ ohm; → law.