Ka wehewehe ʻana o ka mana uila
ʻO ka mana i aʻo ʻia ma ka hana a me ka ikehu ua hoʻoholo ʻia ʻo ia ka hana i hana ʻia i loko o kahi manawa kikoʻī. ʻO ka hana kahi hana o ka hoʻololi ikehu i hiki ke hoʻomaopopo ʻia ka mana he loli i ka ikehu e hana ʻia i loko o kahi manawa kikoʻī.
ʻO ka mana uila kahi loli o ka ikehu uila i loko o kahi manawa kikoʻī. Ma kahi loiloi o ka hiki ke uila, ua wehewehe ʻia e hana ʻia nā loli o ka ikehu hiki ke uila ke hele kahi uku uila ma o kahi ʻokoʻa hiki ke uila.
Ka hoʻohālikelike o ka mana uila
Ma ke ʻano makemakika, ua like ka loli o ka ikehu hiki ke uila (ΔEP) me ka uku (Q) a me ke ana uila (V), i hōʻike ʻia e ka hoohalike ΔEP = Q V.
ʻO ka mana ka loli o ka ikehu uila ma luna o kekahi manawa, i hōʻike ʻia ma ka makemakika ma o ka hoohalike 1:
ʻO ke kālā uila e kahe ana i loko o kekahi manawa he au uila ia, i hōʻike ʻia ma ka makemakika ma o ka hoohalike I = Q/t. Hiki ke hoʻololi ʻia ka hoohalike 1 i ka hoohalike 2:
Ma muli o kēia mau kaulike ʻelua, hiki ke hoʻoholo ʻia he loli ka ikehu uila i loko o kekahi manawa ke hele kahi au uila ma o kahi ʻokoʻa hiki ke uila. Pili ka mana uila i ka ikaika o ke au uila a me ka hiki ke uila, no laila inā piʻi ka au uila a me ka hiki ke uila, piʻi pū ka mana uila.
Inā kahe kahi au uila ma o kahi resistor nona ke kū'ē uila mau, hiki ke helu ʻia ka mana uila me ka hoʻohana ʻana i ka hoohalike 3 a i ʻole ka hoohalike 4.
ʻĀpana o ka mana uila
Ma muli o ka hoʻohālikelike 1, ʻo Joule ke anakahi o ka Ikehu o ka ʻŌnaehana Honua a ʻo ke anakahi o ka manawa o ka ʻŌnaehana Honua ke kekona i hiki ai i ke anakahi o ka mana uila ʻo Joule/kekona, i hoʻopōkole ʻia ʻo J/s. Ua kapa ʻia ʻo Joule/kekona ʻo Watt. 1 Watt = 1 Joule/kekona.
Ma muli o ka hoʻohālikelike 2, ʻo ke anakahi o ka hiki ke uila ʻo Volt a ʻo ke anakahi o ke au uila ʻo Ampere i hiki ai i ke anakahi o ka mana uila ʻo Volt Ampere, i hoʻopōkole ʻia ʻo VA.
