Ann an electromagnetism, canar dian sruth, no dìreach sruth dealain, ris an ìre de dhealan a thèid tro chrois-earrann sam bith de stiùiriche gach aonad ùine. Is e an samhla airson sruth I, agus is e an aonad ampere (A), no dìreach “A” (André-Marie Ampère, 1775-1836, fiosaig Frangach ...
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