Modelová Otázka ID 3537 - 
Watt je jednotkou:
Správná odpověď je: A, D
Watt je jednotkou výkonu, který představuje podíl práce W a času t, za nějž byla tato práce vykonána, tedy 
. Pro jednotku výkonu platí:
[P] = J/s = kg · m2 · s–2 · s–1 = kg · m2 · s–3 = W (watt).
Zároveň je watt jednotkou zářivého toku, který představuje množství energie přenášené elektromagnetickým vlněním, nehledě na vlnovou délku tohoto vlnění. Jednotkou osvětlení je potom lux a jednotkou světelného toku lumen.
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