Kumvetsetsa Mphamvu Zamagetsi
Mphamvu, monga momwe zaphunziridwira mu gawo la ntchito ndi mphamvu, imafotokozedwa ngati ntchito yochitidwa pa nthawi inayake. Ntchito ndi njira yosinthira mphamvu, kotero mphamvu imatha kumvedwa ngati kusintha kwa mphamvu pa nthawi inayake.
Mphamvu yamagetsi ndi kusintha kwa mphamvu yamagetsi pakapita nthawi inayake. Kukambirana za mphamvu yamagetsi kumafotokoza kuti kusintha kwa mphamvu yamagetsi kumachitika pamene mphamvu yamagetsi imadutsa mu kusiyana kwa mphamvu yamagetsi.
Fomula
Mwa masamu, kusintha kwa mphamvu yamagetsi (ΔEP) kumafanana ndi mphamvu (Q) ndi mphamvu yamagetsi (V), zomwe zimafotokozedwa kudzera mu equation ΔEP = Q V. Mphamvu ndi kusintha kwa mphamvu yamagetsi mkati mwa nthawi inayake, komwe kumafotokozedwa mwa masamu kudzera mu equation 1 :
Mphamvu yamagetsi yomwe imayenda mkati mwa nthawi inayake ndi mphamvu yamagetsi , yomwe imafotokozedwa mwa masamu kudzera mu equation I = Q/t. Equation 1 ikhoza kusinthidwa kukhala equation 2 :
Kutengera ndi ma equation awiriwa, zitha kutsimikiziridwa kuti kusintha kwa mphamvu zamagetsi pakapita nthawi inayake kumachitika pamene mphamvu yamagetsi imadutsa mu kusiyana kwa mphamvu yamagetsi. Mphamvu imafanana ndi mphamvu yamagetsi ndipo mphamvu yamagetsi, chifukwa chake, ngati mphamvu yamagetsi ndi/kapena mphamvu yamagetsi ikuwonjezeka, mphamvuyo imawonjezekanso.
Ngati magetsi akuyenda kudzera mu resistor, mphamvu imawerengedwa pogwiritsa ntchito equation 3 kapena equation 4.
Chigawo
Kutengera ndi equation 1 , gawo la mphamvu la International System ndi Joule ndipo gawo la International System la nthawi ndi lachiwiri, kotero gawo la mphamvu ndi Joule/lachiwiri, lofupikitsidwa ngati J/s. Joule/lachiwiri limatchedwanso Watt. 1 Watt = 1 Joule/lachiwiri.
Kutengera ndi equation 2 , unit of electric potential ndi Volt ndipo unit of electric current ndi Ampere kotero unit of electric power ndi Volt Ampere, chidule chake ndi VA.
