Mu AC circuit, pali mitundu iwiri ya mphamvu zamagetsi zomwe zimaperekedwa ku katundu kuchokera ku magetsi: imodzi ndi mphamvu yogwira ntchito ndipo inayo ndi mphamvu yogwira ntchito. Pamene katunduyo ndi mphamvu yoletsa, mphamvu yomwe imagwiritsidwa ntchito ndi mphamvu yogwira ntchito, pamene katunduyo ndi mphamvu yogwira ntchito kapena yoyambitsa, mphamvu yogwiritsira ntchito ndi mphamvu yogwira ntchito. Mphamvu yogwira ntchito ndi mphamvu yamagetsi mu gawo lomwelo (mphamvu ya AC ndi kusiyana pakati pa mphamvu yogwira ntchito ndi yogwira ntchito), pamene mphamvu yamagetsi ipitirira mphamvu yamagetsi, ndi mphamvu yogwira ntchito yoyambitsa; pamene mphamvu yamagetsi ipitirira mphamvu yamagetsi, ndi mphamvu yogwira ntchito yoyambitsa.

Mphamvu yogwira ntchito ndi mphamvu yamagetsi yofunikira kuti zipangizo zamagetsi zigwire ntchito bwino, kutanthauza kuti, kusintha mphamvu yamagetsi kukhala mitundu ina ya mphamvu (mphamvu yamakina, mphamvu yowala, kutentha) ya mphamvu yamagetsi. Mwachitsanzo: 5.5 kilowatts ya mota yamagetsi ndi 5.5 kilowatts ya mphamvu yamagetsi imasinthidwa kukhala mphamvu yamakina, kuyendetsa pampu kuti ipompe madzi kapena makina opunthira; zida zosiyanasiyana zowunikira zidzasinthidwa kukhala mphamvu yowala, kuti anthu azikhala ndi kugwira ntchito zowunikira.

Mphamvu yogwira ntchito ndi yosamveka bwino; ndi mphamvu yamagetsi yomwe imagwiritsidwa ntchito posinthana magetsi ndi maginito mkati mwa dera ndikukhazikitsa ndikusunga mphamvu ya maginito mu zida zamagetsi. Sigwira ntchito kunja, koma imasinthidwa kukhala mitundu ina ya mphamvu. Chipangizo chilichonse chamagetsi chokhala ndi coil yamagetsi chimagwiritsa ntchito mphamvu yogwira ntchito kuti chikhazikitse mphamvu ya maginito. Mwachitsanzo, nyali ya fluorescent ya 40-watt imafuna ma watts opitilira 40 (balast imayeneranso kugwiritsa ntchito gawo la mphamvu yogwira ntchito) kuti itulutse kuwala, komanso imafuna mphamvu yogwira ntchito pafupifupi 80 kuti coil ya ballast ikhazikitse mphamvu ya maginito yosinthana. Chifukwa sichigwira ntchito yakunja, koma chimangotchedwa "reactive".