formula and one example of resistivity
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The resistivity of a material is defined in terms of the magnitude of the electric field across it that gives a certain current density. It is possible to devise an electrical resistivity formula.
ρ=EJρ=EJ
Where:
ρ is the resistivity of the material in ohm metres, Ω⋅m
E is the magnitude of the electric field in volts per metre, V⋅m^-1
J is the magnitude of the current density in amperes per square metre, A⋅m^-2
example the resistivity of a good conductor such as copper is on the order of 1.72 x 10-8 ohm metre (or 17.2 nΩm), whereas the resistivity of a poor conductor (insulator) such as air can be well over 1.5 x 1014 or 150 trillion Ωm
ρ=EJρ=EJ
Where:
ρ is the resistivity of the material in ohm metres, Ω⋅m
E is the magnitude of the electric field in volts per metre, V⋅m^-1
J is the magnitude of the current density in amperes per square metre, A⋅m^-2
example the resistivity of a good conductor such as copper is on the order of 1.72 x 10-8 ohm metre (or 17.2 nΩm), whereas the resistivity of a poor conductor (insulator) such as air can be well over 1.5 x 1014 or 150 trillion Ωm
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The resistivity of a material is the resistance of a wire of that material of unit length and unit cross -section ..
the resistance of a conductor depends on
1-length R directly proportional to length.
2-Area of cross section resistant is inversely proportional to area.
3- temperature
4- material of conductor
unit -ohm
and Anjali have given you example
the resistance of a conductor depends on
1-length R directly proportional to length.
2-Area of cross section resistant is inversely proportional to area.
3- temperature
4- material of conductor
unit -ohm
and Anjali have given you example
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