"CALCUL DES RESISTANCES EQUIVALENTES"
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"                 En s‚rie: R(totale) = R1 + R2"
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"                 En parallŠle: R(totale) = (R1XR2)/(R1+R2)"
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"                 Pont diviseur … vide: Us = U (R2/(R1+R2))"
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"          Us"
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