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. |
