Nkhani yokhudza mphamvu yamagetsi inafotokoza za kuchuluka kwa mphamvu yamagetsi, ndipo mphamvu yamagetsi inafotokozedwanso m'nkhani yokhudza mphamvu yamagetsi. Mphamvu yamagetsi ndi mphamvu yamagetsi zimakhala mu kondakitala pamene pali kusiyana kwa mphamvu pakati pa kondakitala; mosiyana, ngati palibe kusiyana kwa mphamvu yamagetsi, mphamvu yamagetsi kapena mphamvu yamagetsi sizilipo.
Mu kondakitala wachitsulo, mphamvu yamagetsi imafanana mwachindunji ndi mphamvu yamagetsi, komwe chiŵerengero cha mphamvu yamagetsi ndi mphamvu yamagetsi chimakhala chosasinthika. Chiŵerengero cha mphamvu yamagetsi ndi mphamvu yamagetsi chimatchedwa resistivity kapena kukana kwapadera . Mwa masamu, ubale pakati pa mphamvu yamagetsi, mphamvu yamagetsi, ndi kukana kwapadera umafotokozedwa mu equation:
Kufotokozera: ρ = kukana kwapadera, E = mphamvu yamagetsi, J = kuchuluka kwa magetsi
Chimodzi mwa ma formula amagetsi ndi E = V/s pomwe V = kusiyana kwa mphamvu zamagetsi = magetsi ndi s = mtunda, kotero unit yamagetsi ndi Volt/meter (V/m). Fomula ya kachulukidwe ka magetsi ndi J = I/A pomwe I = magetsi ndi A = dera lozungulira la kondakitala, kotero unit ya kachulukidwe ka magetsi ndi Ampere/meter sikweya (A/m 2 ). Fomula yotsutsa ndi ρ = E/J kotero unit ya kukana ndi V/m: A/m 2 = V/mxm 2 /A = V/A (m) = Ω m (werengani: Ohm meter). Ω = Volt/Ampere ndi unit ya kukana magetsi, ponena za unit iyi yafotokozedwa m'nkhani yokhudza lamulo la Ohm.
Ma resistivity apamwamba kwambiri amakhala ndi ma insulators amagetsi kapena ma conductors amagetsi osauka, pomwe ma resistivity otsika kwambiri amakhala ndi ma conductor amagetsi kapena ma conductors abwino amagetsi. Conductor ikayendetsa bwino magetsi, resistivity yake imachepa. Dongosolo la ma conductor achitsulo omwe ali ndi resistivity yapamwamba kwambiri mpaka yotsika kwambiri ndi tin, chitsulo, aluminiyamu, golide, mkuwa, siliva. Chifukwa chake zitha kunenedwa kuti resistivity ya chinthu imasonyeza muyeso wa kuthekera kwa chinthucho kuletsa magetsi.
Kondakitala wabwino amene amatsatira lamulo la Ohm, pa kutentha kwina, mphamvu yake yolimbana ndi magetsi siimasiyana ndi mphamvu yamagetsi, zomwe zikutanthauza kuti ngati mphamvu yamagetsi isintha, mphamvu yamagetsi siisintha. Mosiyana ndi zimenezi, kondakitala amene satsatira lamulo la Ohm, mphamvu yake yolimbana ndi magetsi imadalira mphamvu yamagetsi, zomwe zikutanthauza kuti ngati mphamvu yamagetsi isintha, mphamvu yamagetsi imasinthanso.
Kukana kwa chitsulo kumadalira kutentha. Pamene kutentha kukukwera, kukana kumawonjezeka; mosiyana, pamene kutentha kukuchepa, kukana kumachepa. Pamene kutentha kukukwera, maatomu amayenda mofulumira ndipo amasokonezeka kwambiri, zomwe zimalepheretsa kuyenda kwa ma elekitironi, zomwe zimachepetsa kuyenda kwawo. Pamene kutentha kukuchepa, maatomu amayenda pang'onopang'ono ndipo amakhala okonzedwa bwino, zomwe zimapangitsa kuti ma elekitironi aziyenda bwino.
Chotsutsana ndi resistivity ndi conductivity. Mwa masamu, ubale pakati pa resistivity ndi conductivity umafotokozedwa ndi equation:
σ = 1/ρ
Kufotokozera: σ = conductivity ya kondakitala, ρ = resistivity ya kondakitala.
Chigawo cha resistivity ndi Ωm kotero gawo la conductivity ndi 1/Ωm = (Ωm)-1
Ma conductivity apamwamba kwambiri amakhala ndi ma conductor amagetsi kapena ma conductor abwino amagetsi pomwe ma conductivity otsika kwambiri amakhala ndi ma insulators amagetsi kapena ma conductor amagetsi osauka. Conductor ikayendetsa bwino magetsi, conductivity yake imakulanso. Dongosolo la ma conductor achitsulo omwe ali ndi conductivity yapamwamba kwambiri mpaka yotsika kwambiri ndi siliva, mkuwa, golide, aluminiyamu, chitsulo, tini. Chifukwa chake zitha kuganiziridwa kuti conductivity ya chinthu imasonyeza muyeso wa kuthekera kwa chinthucho kuyendetsa magetsi. Siliva ili ndi conductivity yayikulu koma ndi yokwera mtengo kotero mkuwa umagwiritsidwa ntchito kwambiri ngati conductor ya magetsi.
