1) Ohm's Law :-
Ohm's law is a law that states that the voltage across a resistor is directly proportional to the current flowing through the resistance.
The SI unit of electric resistance is the ohm (Ω)
Ohm's law may be expressed mathematically as :- V/I = R
2) Specific resistance :-
Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied.
Its SI unit is Ω−m.
Specific resistance may be expressed mathematically as :- R = ρx1/A
