Munyaya yacho nezve electric current yakakurukurwawo mumusangano wemagetsi, munda wemagetsi Zvakatsanangurwa munyaya iyi nezveminda yemagetsi. Minda yemagetsi nemagetsi zvinowanikwa muconductor kana paine musiyano ungangoitika pane kondakita, zvakasiyana, kana pasina musiyano unogona kuitika saka hapana simba remagetsi nemagetsi.
Mumuchina wesimbi, simba remagetsi rinoenderana zvakananga nehuwandu hwemagetsi, uko chiyero chesimba remagetsi nehuwandu hwemagetsi chinoramba chiripo. Chiyero chesimba remagetsi nehuwandu hwemagetsi chinonzi rudzi rwekudzivirira kana rudzi rwekudziviriraPamasvomhu, hukama huripo pakati pesimba remagetsi, huwandu hwemagetsi (current density) uye kuramba (resistance) hunoratidzwa muequation iyi:
Tsananguro: ρ = kuramba kwakananga, E = munda wemagetsi, J = kuwanda kwezvino
Imwe yemafomura emagetsi ndeiyi E = V/s apo V = musiyano wesimba remagetsi = voltage yemagetsi uye s = daro, saka unit yesimba remagetsi iVolt/meter (V/m). Fomura yehuwandu hwemagetsi iripo J = I/A apo I = magetsi emagetsi uye A = nzvimbo yechikamu chemubati, saka unit yehuwandu hwemagetsi iripo Ampere/meter yakaenzana (A/m).2Fomura kuramba is ρ = E/J saka chikamu chekudzivirira chakanangana ndeche V/m : A/m2 = V/m x m2/A = V/A (m) = Ω m (verenga: Ohm meter). Ω = Volt/Ampere iyuniti inodzivirira magetsi, iyi yuniti inotsanangurwa munyaya yacho nezve Mutemo waOhm.
Chikamu kuramba kukosha kukuru ndekwevanodzivirira magetsi kana kuti vatungamiriri vemagetsi vasina kunaka, nepo kukosha kwacho kuri kuramba Chidiki chacho chinowanikwa neconductor yemagetsi yakanaka kana conductor yemagetsi. Kana conductor ikafambisa magetsi zviri nani, inoderedza kuramba kondakita. Kurongeka kwemadhaivha esimbi ane kuramba Kubva pahukuru kusvika padiki pane tin, simbi, aruminiyamu, goridhe, mhangura, sirivha. Saka zvinogona kugumiswa kuti kukosha kuramba chinhu chinoratidza hukuru hwekukwanisa kwechinhu kumisa magetsi.
Kondakita akanaka anoteerera mutemo weOhm, patembiricha yakati, kukosha kwayo kwekudzivirira hakuenderane nesimba remagetsi, zvichireva kuti kana hukuru hwesimba remagetsi hukachinja, kukosha kwekudzivirira hakuchinji. Kusiyana neizvi, kondakita asingateereri mutemo weOhm, kukosha kwayo kwekudzivirira kunoenderana nesimba remagetsi, zvichireva kuti kana hukuru hwesimba remagetsi hukachinja, kukosha kwekudzivirira kunochinjawo.
Kuramba kwesimbi kunoenderana nekupisa. Sezvo tembiricha ichiwedzera, kuramba kunowedzera; zvakasiyana, sezvo tembiricha ichiderera, kuramba kunowedzera. Sezvo tembiricha ichiwedzera, maatomu anofamba nekukurumidza uye anowedzera kusagadzikana, zvichikanganisa kufamba kwemaerekitironi, zvichideredza kufamba kwawo. Sezvo tembiricha ichiderera, maatomu anofamba zvishoma nezvishoma uye akarongeka, zvichiita kuti maerekitironi afambe zvakanaka.
Chinopesana ne resistivity i conductivity. Pamasvomhu, hukama huripo pakati pe resistivity ne conductivity hunoratidzwa ne equation:
σ = 1/ρ
Tsananguro: σ = kufambisa kwemuchina, ρ = kudzivirira kwemuchina.
Chikamu chekudzivirira simba (resistivity) iΩm saka chikamu chekufambisa simba (conductivity) i1/Ωm = (Ωm)-1
Makomputa emagetsi kana maconductor akanaka emagetsi ane maconductor akakwirira, nepo maconductor akaderera ari emagetsi anochengetedza magetsi kana maconductor asina kunaka. Kana conductor ikafambisa magetsi zviri nani, conductor yacho inowedzera. Kurongeka kwemaconductor esimbi ane conductivity yepamusoro kusvika pasi ndeyesirivha, mhangura, goridhe, aruminiyamu, simbi, tin. Saka zvinogona kugumiswa kuti conductivity yechinhu inoratidza chiyero chekugona kwechinhu kuitisa magetsi. Sirivha ine conductivity yakakwira asi inodhura saka mhangura inoshandiswa zvakanyanya se conductor yemagetsi.
