effektretning
Effektretning is a term commonly used in Danish and Norwegian technical literature to denote the direction in which energy or an effect is transmitted by a system. Because the concept is highly context dependent, definitions are given within the relevant discipline—for example electrical engineering, acoustics, hydraulics, and control theory.
In electrical engineering, effektretning describes the direction of power flow. Under standard sign conventions, power is
In acoustics and fluid systems, effektretning denotes the direction in which sound, pressure, or fluid power
Practical diagrams often use arrows to represent effektretning, with polarity markings to show the intended direction
See also: power flow, sign convention, energy transfer, Poynting vector.