ühefaasilised

Ühefaasilised is Estonian term that describes something having one electrical phase. In electrical engineering and electricity distribution, ühefaasilised refers to single-phase systems and devices designed to operate on a single alternating current (AC) phase.

A single-phase system typically delivers power through two conductors: a live conductor and a neutral (some designs use ground). The frequency is usually 50 Hz in Europe and 60 Hz in parts of the Americas; nominal voltages vary by region, commonly around 230 volts in many European countries and about 120 volts in North America. Ühefaasilised systems are contrasted with kolmeaFAASILised (three-phase) systems, which distribute power over three simultaneous AC phases.

Applications and equipment commonly described as ühefaasilised include household electrical circuits, many consumer appliances, heaters, and small motors. They are favored for simple, low-cost installations and for supplying residential or light-duty loads. For larger or industrial-scale power demands, three-phase systems are preferred due to better power density, efficiency, and smoother operation of motors; single-phase arrangements can suffer from higher current for the same power and poorer starting characteristics in motors.

Etymology and usage: the term derives from Estonian yhd1 is one (üks) plus phase (faas); the plural adjective ühefaasilised appears in technical and professional texts to distinguish single-phase equipment from three-phase counterparts.

See also: kolmeaasilised, elektrienergia, jaotuvus, elektrimootor.