Bó͘-lú-to͘h

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1.5 V ê 2 hō tiān-tî.

Bó͘-lú-to͘h ia̍h volt sī piáu-sī tiān-ap ê SI cho͘-ha̍p tan-ūi, kì chò V. 1 V sī tēng-gī chò hō͘ 1 an ê tiān-liû sán-seng 1 ê kong-lu̍t ê tiān-ūi-chha (potential difference), khiā kóng:

\mbox{V} = \mbox{W} \cdot \mbox{A}^{-1} = \mbox{J} \cdot \mbox{C}^{-1} = \mbox{m}^2 \cdot \mbox{kg} \cdot \mbox{s}^{-3} \cdot \mbox{A}^{-1}.