Lus qhia rau kev siv: Hloov ua lwm yam amps (А) mus ohms (Ω), sau tus nqi tam sim no I hauv amperes (А), voltage U hauv volts (В) lub zog P hauv watts (Hnub Tuesday), ces nias lub pob “Cuas”. Yog li, tus nqi kuj yuav tau txais R в . Txhawm rau rov pib dua cov ntaub ntawv nkag, nyem lub pob sib txuas.
Cov ntsiab lus
Tshuab xam zauv А в Om (ntawm volts)
Formula rau kev txhais lus А в Om
Kuj R hauv ohms (Ω) yog sib npaug rau qhov voltage U hauv volts (В) faib los ntawm tam sim no I hauv amperes (А).
Tshuab xam zauv А в Om (ntawm watts)
Formula rau kev txhais lus А в Om
Kuj R hauv ohms (Ω) yog sib npaug zog P hauv watts (Hnub Tuesday) muab faib los ntawm lub zog tam sim no I hauv amperes (А) squared.