noun
single-phase alternating current
Technical term in electrical engineering. Refers to AC power using a single alternating voltage waveform, as opposed to three-phase AC.
家庭用電源は単相交流で供給されることが多い。
Household power is often supplied as single-phase alternating current.
Compound of 単相 (single-phase) and 交流 (alternating current). The term is a direct technical description with no obscure historical derivation.