component of an electric current in a branch of an alternating-current circuit that is in phase with the voltage, elektrilise pingega faasis olev vool, for a two-terminal element or a two-terminal circuit supplied by a periodic voltage, component of the electric current proportional to the voltage with a proportionality factor equal to the active pow, elektrivoolu osa kahe klemmiga elemendi või kahe klemmiga perioodilise pingega varustatava ahela puhul, mis on võrdeline pingega, mille proportsionaalsustegur on võrdne vahelduvvooluga, mis on jagatud