Physics, 27.12.2021 09:00 AleOfficial101
La « lampe torche » que possède Sofia n'éclaire plus ; le boîtier contient trois piles, chacunes des
tensions nominales est égale à 1,5 V; elles sont branchées en série pour alimenter l'ampoule à
D. E.L. avec une tension nominale de 4,5 V.
Pour déterminer l'origine de la panne, Sofia dispose d'un multimètre dont les calibres sont :
1 000 V; 200 V; 20 V; 2 V; 200 mV.
1 - Sofia effectue le branchement pour mesurer la tension d'une pile ; elle sélectionne d'abord
calibre 1 000 V du multimètre et l'écran affiche la valeur : 001
Commente ce résultat et explique pourquoi Sofia doit adapter le calibre en fonction de la
mesure.
Answers: 2
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