5.Na żarówce widnieje napis 6V/0,9W.Jaki jest opór tej żarówki?
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5.Na żarówce widnieje napis 6V/0,9W.Jaki jest opór tej żarówki?
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U = 6V
P = 0,9W
P = UI => I = P/U
I = 0,9W/6V = 0,15A
R = U/I
R = 6V/0,15A = 40Ω
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