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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 oá ê kong-lu̍t ê tiān-ūi-chha (potential difference), khiā kóng:
.
Chit phiⁿ bûn-chiuⁿ chi̍t phí-á-kiáⁿ. Chhiáⁿ tàu siu-kái hō· i ū phong-phài ê lōe-iông.