txheem
Lus qhia rau kev siv: Hloov ua lwm yam amps (Аmus volt-amperes (VA), sau cov nqi tam sim no I hauv amperes (A), voltage U hauv volts (В), ces nias lub "xam”. Yog li, lub zog tag nrho yuav tau txais S в VA. Txhawm rau rov pib dua cov ntaub ntawv nkag, nyem lub pob sib txuas.
Tshuab xam zauv А в VA (1 theem)
Formula rau kev txhais lus А в VA
SVA = KuvА ⋅ UAВ
Tag nrho cov hwj huam S nyob rau hauv volt-amperes (VA) ntawm ib theem network yog sib npaug rau cov khoom ntawm lub zog tam sim no I hauv amperes (A) rau voltage U hauv volts (В).
Tshuab xam zauv А в VA (3 theem, kab voltage)
Formula rau kev txhais lus А в VA
SVA = √3 ⋅ IА ⋅ UAВ
Tag nrho cov hwj huam S nyob rau hauv volt-amperes (VA) ntawm peb-theem network nrog kab-rau-kab voltage yog sib npaug rau lub hauv paus square ntawm peb zaug tam sim no I hauv amperes (А) thiab voltage U hauv volts (В).
Tshuab xam zauv А в VA (3 theem, theem voltage)
Formula rau kev txhais lus А в VA
SVA = 3 ⋅ ibА ⋅ UAВ
Tag nrho cov hwj huam S nyob rau hauv volt-amperes (VA) ntawm peb-theem network nrog theem voltage yog sib npaug rau peb zaug cov khoom ntawm lub zog tam sim no I hauv amperes (А) rau voltage U hauv volts (В).