Lub tswv yim ntawm hluav taws xob tam sim no

Hauv kev siv hluav taws xob (electromagnetism), qhov ntau ntawm cov hluav taws xob uas hla dhau ib ntu ntawm tus neeg coj hluav taws xob hauv ib lub sijhawm hu ua qhov muaj zog tam sim no, lossis tsuas yog hluav taws xob tam sim no. Lub cim rau tam sim no yog I, thiab chav tsev yog ampere (A), lossis tsuas yog "A" (André-Marie Ampère, 1775-1836, Fabkis tus kws tshawb fawb thiab kws tshuaj lom neeg, uas tau ua tiav zoo hauv kev kawm txog cov teebmeem hluav taws xob thiab kuj tau ua cov txiaj ntsig rau kev suav lej thiab physics. Lub chav thoob ntiaj teb ntawm hluav taws xob tam sim no, ampere, yog lub npe tom qab nws lub xeem).
[1] Kev txav mus los tsis tu ncua ntawm cov nqi dawb hauv tus neeg coj hluav taws xob nyob rau hauv qhov kev ua ntawm lub zog hluav taws xob tsim cov hluav taws xob tam sim no.
[2] Hauv hluav taws xob, nws tau teev tseg tias qhov kev taw qhia ntawm cov nqi zoo yog qhov kev taw qhia ntawm tam sim no. Tsis tas li ntawd, hauv kev tsim kho, qhov kev taw qhia ntawm cov nqi zoo kuj tseem siv ua qhov kev taw qhia ntawm tam sim no. Qhov loj ntawm tam sim no yog qhia los ntawm tus nqi Q ntws los ntawm qhov seem ntawm tus neeg coj hluav taws xob ib lub sijhawm, uas hu ua qhov muaj zog tam sim no.
[3] Muaj ntau hom kev nqa hluav taws xob hauv xwm uas nqa hluav taws xob. Piv txwv li: cov electrons txav tau hauv cov conductors, ions hauv electrolytes, electrons thiab ions hauv plasma, thiab quarks hauv hadrons. Kev txav ntawm cov neeg nqa khoom no tsim cov hluav taws xob tam sim no.