The most important aspect of it was summarized in 1827's The Galvanic Circuit Investigated Mathematically. A statement of proportionality, it defines the units of resistivity in terms of force per unit charge. On a macroscopic level, it states that current density is equal to the product of the electric field and the characteristic conductivity of the medium. FTP, what is this law named for a German physicist that is most commonly formulated for 
The most important aspect of it was summarized in 1827's The Galvanic Circuit Investigated Mathematically. A statement of proportionality, it defines the units of resistivity in terms of force per unit charge. On a macroscopic level, it states that current density is equal to the product of the electric field and the characteristic conductivity of the medium. FTP, what is this law named for a German physicist that is most commonly formulated for a circuit as "voltage is equal to current times resistance"?
The most important aspect of it was summarized in 1827's The Galvanic Circuit Investigated Mathematically.
{Ohm}’s Law