AC thiab DC dual-siv txhais tau hais tias nws tuaj yeem yog AC fais fab mov lossis DC fais fab mov.
AC txhais tau tias AC fais fab, hos DC txhais tau tias DC fais fab.
Lub npe tag nrho ntawm AC tam sim no yog Alternating Current, uas txhais tau hais tias cov kev taw qhia tam sim no hloov pauv raws sijhawm. Tus nqi nruab nrab ntawm kev ua haujlwm hauv ib lub voj voog yog xoom. Lub npe tag nrho ntawm DC tam sim no yog Direct Current, tseem hu ua "tam sim no tsis tu ncua". Tsis tu ncua tam sim no yog ib hom DC tam sim no, uas muaj qhov loj thiab cov kev taw qhia tib yam. Thaum kis tau tus tib lub zog, cov hlau siv rau DC kis tau tus mob tsuas yog 2/3 ~ 1/2 ntawm qhov ntawd rau AC kis tau tus mob.