Lus qhia rau kev siv: Hloov ua lwm yam joules (Jnyob rau hauv watts (Hnub Tuesday), nkag mus rau tus nqi zog E hauv joules (J), ib lub sijhawm t hauv vib nas this (с), ces nias lub pob “Cuas”. Yog li, tus nqi hluav taws xob yuav tau txais P hauv watts (Hnub Tuesday). Txhawm rau rov pib dua cov ntaub ntawv nkag, nyem lub pob sib txuas.
Cov ntsiab lus
Tshuab xam zauv J в Hnub Tuesday
Formula rau kev txhais lus J в Hnub Tuesday
hwj chim P hauv watts (Hnub Tuesday) yog sib npaug rau lub zog E hauv joules (J) muab faib los ntawm lub sij hawm hauv vib nas this (с).