Resistance and resistivity are completely same or have some difference????
Answers
=>Resistance:-
The term resistance , itself , makes clear about what it is.
Resistance means opposition, hence , in physics , resistance of a substance means the ability of the substance to oppose the flow of current through it.
Different kind of substance have different resistances. The substances which offer low resistance( that allow the flow of current through them more easily) are conductors , and those which have high resistance are insulators or bad conductors.
=>SI Unit of resistance is ohm.
=>Resistance depends on length of a material,area of cross section of the wire , temperature.
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Now let's see what resistivity is :-
This term is somewhat similar to resistance, right ?
Yes it is !
Resistivity is the property of substances , about its resistances.
Resistivity gives us the information , whether a substance conducts electricity or not.
=> Resistivity depends on the nature of substance.
=> It's SI unit is ohm-metre
Resistance is the term which is the resisting of flowing of charges from a specific substance of any size.
Consider we have a solid substance of copper. It will have a resisting of charges from flowing through the substance.
If we change its length and area provided to drift of charge, its resistance will vary.
But the one thing that will constant for all copper substance of any shape and size is resistivity. The resistance of a substance of copper , iron , germanium will vary if we change the shape and size of that substance, but its resistivity is constant at any shape and size.
Resistivity is different in copper,Iron etc because of their nature,but if we change the shape,only resistance will change.
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Resistivity is like the density of a material that is constant and resistance is like the mass which will depend on the length area or (volume) of substance.