Txhais: Qhov kev hloov pauv yog hais txog qhov voltage piv lossis qhov piv tam sim no. Nws yog ib qho cuab yeej hloov hluav taws xob los yog tam sim no, thiab qhov voltage lossis tam sim no piv ntawm thawj winding thiab theem nrab winding. Nyob rau hauv lub transformer, tus piv ntawm thawj sab electromotive quab yuam E1 mus rau theem nrab sab E2 yog hu ua qhov sib piv ntawm transformer, uas yog sawv cev los ntawm k, uas yog, k=E1/E2.
Lub peev xwm induced nyob rau hauv thawj winding ntawm lub transformer thiab lub thib ob winding ntawm lub transformer yog proportional rau tus naj npawb ntawm lem ntawm winding.
Qhov piv ntawm qhov input voltage ntawm thawj winding rau cov zis voltage ntawm lub thib ob winding yog sib npaug rau lawv lem ratio, thiab tus ratio K yog hu ua tus ratio coefficient.