I am really confused between Resistance and Resistivity... can you explain me the difference??
Answers
Resistance across a conductor is the ratio of the potential difference across it to the current flowing through it. It can vary depending on the voltage and Electric current. It's unit is Ohm.
Resistivity of a material is the ratio of electric field strength to the current density at a specific temperature. Resistivity is a constant, and it's unit is ohm-meter.
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.