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R2 = 3Ω
R3 = 6Ω
U = 4,5 V
I = ?
Rz - oporność zastępcza oporników
1/Rz = 1/R1 + 1/R2 + 1/R3 = 1/2 + 1/3 + 1/6 = 3/6 + 2/6 + 1/6 = 6/6 = 1
1/Rz = 1
Rz = 1Ω
I - natęzenie prądu = U/Rz = 4,5/1 = 4,5 A