Modelová Otázka ID 3439 - 
Jaká je celková vodivost dvou sériově zapojených rezistorů o odporu 25 Ω?
Správná odpověď je: A, D
Výsledný elektrický odpor sériově zapojených rezistorů je roven součtu odporů jednotlivých rezistorů, v tomto případě R = R1 + R2 = 50 Ω. Vodivost je převrácenou hodnotou elektrického odporu, pro vodivost této soustavy tak platí:
G = 1/R = 1/50 Ω = (50 Ω)–1 = 0,02 Ω–1 = 0,02 S = 20 mS.
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