what is the expression for the resistance of a metallic wire in terms of resistivity
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The electrical resistanceof a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: If the resistance is constant over a considerable range of voltage, then Ohm's law, I = V/R, can be used to predict the behavior of the material.
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Resistance is directly proportional to:-
length,area of cross section and resistivity.
r=ῥL/A
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