Modelová Otázka ID 3514 - 
Které z následujících tvrzení správně popisuje obvod se střídavým proudem?
Správná odpověď je: A, C
Reaktance je součást impedance, která je tvořena induktancí (induktivní reaktancí) a kapacitancí (kapacitní reaktancí), tedy fyzikálními veličinami, které popisují chování součástek s vlastnostmi cívky (induktance) a kondenzátoru (kapacitance) v obvodu se střídavým proudem. Impedance pak představuje propojení reaktance a elektrického odporu R, vyjadřuje tedy jak elektrický odpor, tak fázový posun napětí vůči proudu uvnitř daného obvodu. Pro impedanci platí vzorec
.
Impedance charakterizuje obvod s vlastnostmi rezistoru o odporu R, cívky o indukčnosti L a kondenzátoru o kapacitě C, popisuje tedy složený RLC obvod. K rezonanci dojde tehdy, je‑li reaktance nulová, to znamená, platí‑li XC = XL.
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