The mathematical expression of Ohm's law is______ The units of the three physical quantities I, u and R in the formula are______ 、______ 、______ .

The mathematical expression of Ohm's law is______ The units of the three physical quantities I, u and R in the formula are______ 、______ 、______ .

The content of Ohm's law is: the current in a conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor; the mathematical expression is I = ur; the unit of current is ampere, represented by the symbol a; the unit of voltage is volt, represented by the symbol V; the unit of ohm is Ohm, represented by the symbol Ω; so the answer is: I = ur; Ampere (a); volt (V); Ohm (Ω)