Definition of ohm law

V = I * R

V=Voltage (Volts), I=Current (Amps), R=Resistance (Ohms), Z=Impedance(Ohms)

impedance is similar to resistance but pertains to AC circuits only

(voltage across an element ) = (current through the element) * (the element's resistance, or impedance if you are dealing with AC)

"voltage" is the potential or force that pushes electrical current

"current" is referring to the amount of electrons(negatively charged particles) flowing past a fixed point in a given amount of time

"resistance" is an elements opposition to current flow, so an element with a high resistance will allow less current to flow through it than an element with a lower resistance (given they have the same voltage across them)

and by element I mean a component or device not a pure substance

ohms law states that the current flowing through leaniar electrical characteristic conductor is directly proportional to the potential difference applied across the terminals provided the temperature is kept constant.