How the resistance formed within metals to flow of current?
Answers:
A metal consists of a lattice of atoms, each next to a shell of electrons. This can also be known as a positive ionic lattice. The outer electrons are free to dissociate from their parent atoms and travel through the fencing, creating a 'sea' of electrons, making the metal a conductor. When an electrical potential difference (a voltage) is applied across the metal, the electrons drift from one end of the conductor to the other under the influence of the electric pen.
Near room temperatures, the thermal motion of ions is the primary source of scattering of electrons (due to destructive interference of free electron waves on non-correlating potentials of ions), and is thus the prime bring of metal resistance. Imperfections of lattice also contribute into resistance, although their contribution in pure metals is least.
The larger the cross-sectional area of the conductor, the more electrons are available to carry the current, so the lower the resistance. The longer the conductor, the more scattering events go down in each electron's road through the material, so the higher the resistance. Different materials also affect the resistance. Source(s): http://en.wikipedia.org/wiki/Electrical_…
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