What decides the electrical conductivity of metals?
Answers
Answered by
0
hi
Electrical conductivity in metals is a result of the movement of electrically charged particles. The atoms of metal elements are characterized by the presence of valence electrons, which are electrons in the outer shell of an atom that are free to move about. It is these 'free electrons' that allow metals to conduct an electric current.
Because valence electrons are free to move they can travel through the lattice that forms the physical structure of a metal.
Under an electric field, free electrons move through the metal much like billiard balls knocking against each other, passing an electric charge as they move.
Metal Conductivity
Conduction in metals must follow Ohm's law, which states that the current is directly proportional to the electric field applied to the metal.
The law, named after German physicist Georg Ohm, appeared in 1827 in a published paper laying out how current and voltage are measured via electrical circuits. The key variable in applying Ohm's law is a metal's resistivity.
Resistivity is the opposite of electrical conductivity, evaluating how strongly a metal opposes the flow of electric current. This is commonly measured across the opposite faces of a one-meter cube of material and described as an ohm meter (Ω⋅m). Resistivity is often represented by the Greek letter rho (ρ).
Electrical conductivity, on the other hand, is commonly measured by siemens per meter (S⋅m−1) and represented by the Greek letter sigma (σ). One siemens is equal to the reciprocal of one ohm.
Electrical conductivity in metals is a result of the movement of electrically charged particles. The atoms of metal elements are characterized by the presence of valence electrons, which are electrons in the outer shell of an atom that are free to move about. It is these 'free electrons' that allow metals to conduct an electric current.
Because valence electrons are free to move they can travel through the lattice that forms the physical structure of a metal.
Under an electric field, free electrons move through the metal much like billiard balls knocking against each other, passing an electric charge as they move.
Metal Conductivity
Conduction in metals must follow Ohm's law, which states that the current is directly proportional to the electric field applied to the metal.
The law, named after German physicist Georg Ohm, appeared in 1827 in a published paper laying out how current and voltage are measured via electrical circuits. The key variable in applying Ohm's law is a metal's resistivity.
Resistivity is the opposite of electrical conductivity, evaluating how strongly a metal opposes the flow of electric current. This is commonly measured across the opposite faces of a one-meter cube of material and described as an ohm meter (Ω⋅m). Resistivity is often represented by the Greek letter rho (ρ).
Electrical conductivity, on the other hand, is commonly measured by siemens per meter (S⋅m−1) and represented by the Greek letter sigma (σ). One siemens is equal to the reciprocal of one ohm.
Answered by
0
it is result of the movement of electrically charged particles .because valence electrons are free to move they can travel through the lattice that form the physical structure of metals
Similar questions